- •Contents
- •Preface
- •How to use this book
- •Chapter 1 Units, constants, and conversions
- •1.1 Introduction
- •1.2 SI units
- •1.3 Physical constants
- •1.4 Converting between units
- •1.5 Dimensions
- •1.6 Miscellaneous
- •Chapter 2 Mathematics
- •2.1 Notation
- •2.2 Vectors and matrices
- •2.3 Series, summations, and progressions
- •2.5 Trigonometric and hyperbolic formulas
- •2.6 Mensuration
- •2.8 Integration
- •2.9 Special functions and polynomials
- •2.12 Laplace transforms
- •2.13 Probability and statistics
- •2.14 Numerical methods
- •Chapter 3 Dynamics and mechanics
- •3.1 Introduction
- •3.3 Gravitation
- •3.5 Rigid body dynamics
- •3.7 Generalised dynamics
- •3.8 Elasticity
- •Chapter 4 Quantum physics
- •4.1 Introduction
- •4.3 Wave mechanics
- •4.4 Hydrogenic atoms
- •4.5 Angular momentum
- •4.6 Perturbation theory
- •4.7 High energy and nuclear physics
- •Chapter 5 Thermodynamics
- •5.1 Introduction
- •5.2 Classical thermodynamics
- •5.3 Gas laws
- •5.5 Statistical thermodynamics
- •5.7 Radiation processes
- •Chapter 6 Solid state physics
- •6.1 Introduction
- •6.2 Periodic table
- •6.4 Lattice dynamics
- •6.5 Electrons in solids
- •Chapter 7 Electromagnetism
- •7.1 Introduction
- •7.4 Fields associated with media
- •7.5 Force, torque, and energy
- •7.6 LCR circuits
- •7.7 Transmission lines and waveguides
- •7.8 Waves in and out of media
- •7.9 Plasma physics
- •Chapter 8 Optics
- •8.1 Introduction
- •8.5 Geometrical optics
- •8.6 Polarisation
- •8.7 Coherence (scalar theory)
- •8.8 Line radiation
- •Chapter 9 Astrophysics
- •9.1 Introduction
- •9.3 Coordinate transformations (astronomical)
- •9.4 Observational astrophysics
- •9.5 Stellar evolution
- •9.6 Cosmology
- •Index
Chapter 6 Solid state physics
6.1Introduction
This section covers a few selected topics in solid state physics. There is no attempt to do more than scratch the surface of this vast field, although the basics of many undergraduate texts on the subject are covered. In addition a period table of elements, together with some of their physical properties, is displayed on the next two pages.
6
Periodic table (overleaf) Data for the periodic table of elements are taken from Pure Appl. Chem., 71, 1593–1607 (1999), from the 16th edition of Kaye and Laby Tables of Physical and Chemical Constants (Longman, 1995) and from the 74th edition of the CRC Handbook of Chemistry and Physics (CRC Press, 1993). Note that melting and boiling points have been converted to kelvins by adding 273.15 to the Celsius values listed in Kaye and Laby. The standard atomic masses reflect the relative isotopic abundances in samples found naturally on Earth, and the number of significant figures reflect the variations between samples. Elements with atomic masses shown in square brackets have no stable nuclides, and the values reflect the mass numbers of the longest-lived isotopes. Crystallographic data are based on the most common forms of the elements (the α-form, unless stated otherwise) stable under standard conditions. Densities are for the solid state. For full details and footnotes for each element, the reader is advised to consult the original texts.
Elements 110, 111, 112 and 114 are known to exist but their names are not yet permanent.
124 |
Solid state physics |
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6.2Periodic table
1
Hydrogen |
name |
1.007 94 |
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1H
1 |
1s1 |
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atomic number |
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relative atomic mass (u) |
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89 (β) 378 |
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Titanium |
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HEX |
1.632 |
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2 |
electron configuration |
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47.867 |
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symbol |
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13.80 |
20.28 |
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22 |
Ti |
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Lithium |
Beryllium |
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[Ca]3d2 |
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6.941 |
9.012 182 |
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density (kgm−3) |
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4 508 |
295 |
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lattice constant, a (fm) |
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2 |
3 |
Li |
4 |
Be |
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HEX |
1.587 |
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[He]2s1 |
[He]2s2 |
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crystal type |
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1 943 |
3 563 |
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c/a (angle in RHL, |
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533 (β) 351 |
1 846 |
229 |
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c/a |
in ORC & MCL) |
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BCC |
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HEX |
1.568 |
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b/a |
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453.65 |
1 613 |
1 560 |
2 745 |
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melting point (K) |
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boiling point (K) |
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Sodium |
Magnesium |
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22.989 770 |
24.305 0 |
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3 |
11 |
Na |
12 |
Mg |
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[Ne]3s1 |
[Ne]3s2 |
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966 |
429 |
1 738 |
321 |
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BCC |
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HEX |
1.624 |
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3 |
4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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370.8 |
1 153 |
923 |
1 363 |
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Potassium |
Calcium |
Scandium |
Titanium |
Vanadium |
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Chromium |
Manganese |
Iron |
Cobalt |
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39.098 3 |
40.078 |
44.955 910 |
47.867 |
50.941 5 |
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51.996 1 |
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54.938 049 |
55.845 |
58.933 200 |
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4 |
19 |
K |
20 |
Ca |
21 |
Sc |
22 |
Ti |
23 |
V |
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24 |
Cr |
25 |
Mn |
26 |
Fe |
27 |
Co |
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[Ar]4s1 |
[Ar]4s2 |
[Ca]3d1 |
[Ca]3d2 |
[Ca]3d3 |
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[Ar]3d54s1 |
[Ca]3d5 |
[Ca]3d6 |
[Ca]3d7 |
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862 |
532 |
1 530 |
559 |
2 992 |
331 |
4 508 |
295 |
6 090 |
302 |
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7 194 |
388 |
7 473 |
891 |
7 873 |
287 |
8 800 |
( ) 251 |
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BCC |
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FCC |
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HEX |
1.592 |
HEX |
1.587 |
BCC |
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BCC |
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FCC |
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BCC |
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HEX |
1.623 |
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336.5 |
1 033 |
1 113 |
1 757 |
1 813 |
3 103 |
1 943 |
3 563 |
2 193 |
3 673 |
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2 180 |
2 943 |
1 523 |
2 333 |
1 813 |
3 133 |
1 768 |
3 203 |
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Rubidium |
Strontium |
Yttrium |
Zirconium |
Niobium |
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Molybdenum |
Technetium |
Ruthenium |
Rhodium |
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85.467 8 |
87.62 |
88.905 85 |
91.224 |
92.906 38 |
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95.94 |
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[98] |
101.07 |
102.905 50 |
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5 |
37 |
Rb |
38 |
Sr |
39 |
Y |
40 |
Zr |
41 |
Nb |
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42 |
Mo |
43 |
Tc |
44 |
Ru |
45 |
Rh |
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[Kr]5s1 |
[Kr]5s2 |
[Sr]4d1 |
[Sr]4d2 |
[Kr]4d45s1 |
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[Kr]4d55s1 |
[Sr]4d5 |
[Kr]4d75s1 |
[Kr]4d85s1 |
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1 533 |
571 |
2 583 |
608 |
4 475 |
365 |
6 507 |
323 |
8 578 |
330 |
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10 222 |
315 |
11 496 |
274 |
12 360 |
270 |
12 420 |
380 |
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BCC |
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FCC |
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HEX |
1.571 |
HEX |
1.593 |
BCC |
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BCC |
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HEX |
1.604 |
HEX |
1.582 |
FCC |
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312.4 |
963.1 |
1 050 |
1 653 |
1 798 |
3 613 |
2 123 |
4 673 |
2 750 |
4 973 |
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2 896 |
4 913 |
2 433 |
4 533 |
2 603 |
4 423 |
2 236 |
3 973 |
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Caesium |
Barium |
Lanthanides |
Hafnium |
Tantalum |
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Tungsten |
Rhenium |
Osmium |
Iridium |
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132.905 45 |
137.327 |
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178.49 |
180.947 9 |
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183.84 |
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186.207 |
190.23 |
192.217 |
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6 |
55 |
Cs |
56 |
Ba |
57 – 71 |
72 |
Hf |
73 |
Ta |
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74 |
W |
75 |
Re |
76 |
Os |
77 |
Ir |
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[Xe]6s1 |
[Xe]6s2 |
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[Yb]5d2 |
[Yb]5d3 |
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[Yb]5d4 |
[Yb]5d5 |
[Yb]5d6 |
[Yb]5d7 |
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1 900 |
614 |
3 594 |
502 |
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13 276 |
319 |
16 670 |
330 |
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19 254 |
316 |
21 023 |
276 |
22 580 |
273 |
22 550 |
384 |
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BCC |
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BCC |
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HEX |
1.581 |
BCC |
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BCC |
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HEX |
1.615 |
HEX |
1.606 |
FCC |
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301.6 |
943.2 |
1 001 |
2 173 |
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2 503 |
4 873 |
3 293 |
5 833 |
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3 695 |
5 823 |
3 459 |
5 873 |
3 303 |
5 273 |
2 720 |
4 703 |
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Francium |
Radium |
Actinides |
Rutherfordium |
Dubnium |
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Seaborgium |
Bohrium |
Hassium |
Meitnerium |
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[223] |
[226] |
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[261] |
[262] |
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[263] |
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[264] |
[265] |
[268] |
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7 |
87 |
Fr |
88 |
Ra |
89 – 103 |
104 |
Rf |
105 |
Db |
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106 |
Sg |
107 |
Bh |
108 |
Hs |
109 |
Mt |
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[Rn]7s1 |
[Rn]7s2 |
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[Ra]5f146d2 |
[Ra]5f146d3? |
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[Ra]5f146d4? |
[Ra]5f146d5? |
[Ra]5f146d6? |
[Ra]5f146d7? |
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5 000 |
515 |
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BCC |
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300 |
923 |
973 |
1 773 |
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Lanthanum |
Cerium |
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Praseodymium |
Neodymium |
Promethium |
Samarium |
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138.905 5 |
140.116 |
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140.907 65 |
144.24 |
[145] |
150.36 |
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Lanthanides |
57 |
La |
58 |
Ce |
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59 |
Pr |
60 |
Nd |
61 |
Pm |
62 |
Sm |
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[Ba]5d1 |
[Ba]4f15d1 |
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[Ba]4f3 |
[Ba]4f4 |
[Ba]4f5 |
[Ba]4f6 |
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6 174 |
377 |
6 711 |
(γ) 516 |
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6 779 |
367 |
7 000 |
366 |
7 220 |
365 |
7 536 |
363 |
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HEX |
3.23 |
FCC |
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HEX |
3.222 |
HEX |
3.225 |
HEX |
3.19 |
HEX |
7.221 |
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1 193 |
3 733 |
1 073 |
3 693 |
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1 204 |
3 783 |
1 289 |
3 343 |
1 415 |
3 573 |
1 443 |
2 063 |
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Actinium |
Thorium |
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Protactinium |
Uranium |
Neptunium |
Plutonium |
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[227] |
232.038 1 |
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231.035 88 |
238.028 9 |
[237] |
[244] |
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Actinides |
89 |
Ac |
90 |
Th |
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91 |
Pa |
92 |
U |
93 |
Np |
94 |
Pu |
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[Ra]6d1 |
[Ra]6d2 |
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[Rn]5f26d17s2 |
[Rn]5f36d17s2 |
[Rn]5f46d17s2 |
[Rn]5f67s2 |
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10 060 |
531 |
11 725 |
508 |
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15 370 |
392 |
19 050 |
285 |
20 450 |
666 |
19 816 |
618 |
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FCC |
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FCC |
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TET |
0.825 |
ORC |
1.736 |
ORC |
0.733 |
MCL |
1.773 |
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2.056 |
0.709 |
0.780 |
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1 323 |
3 473 |
2 023 |
5 063 |
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1 843 |
4 273 |
1 405.3 |
4 403 |
913 |
4 173 |
913 |
3 503 |
6.2 Periodic table |
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125 |
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Helium |
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4.002 602 |
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2 |
He |
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1s2 |
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BCC |
body-centred cubic |
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120 |
356 |
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CUB |
simple cubic |
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HEX |
1.631 |
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DIA |
diamond |
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13 |
14 |
15 |
16 |
17 |
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3-5 |
4.22 |
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FCC |
face-centred cubic |
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Boron |
Carbon |
Nitrogen |
Oxygen |
Fluorine |
Neon |
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HEX |
hexagonal |
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10.811 |
12.0107 |
14.006 74 |
15.999 4 |
18.998 403 2 |
20.179 7 |
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MCL |
monoclinic |
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5 |
B |
6 |
C |
7 |
N |
8 |
O |
9 |
F |
10 |
Ne |
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ORC |
orthorhombic |
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[Be]2p1 |
[Be]2p2 |
[Be]2p3 |
[Be]2p4 |
[Be]2p5 |
[Be]2p6 |
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RHL |
rhombohedral |
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2 466 |
1017 |
2 266 |
357 |
1 035 (β) 405 |
1 460 |
(γ) 683 |
1 140 |
550 |
1 442 |
446 |
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TET |
tetragonal |
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RHL |
65◦ 7 |
DIA |
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HEX |
1.631 |
CUB |
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MCL |
1.32 |
FCC |
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0.61 |
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(t-pt) |
triple point |
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2 348 |
4 273 |
4 763 |
(t-pt) |
63 |
77.35 |
54.36 |
90.19 |
53.55 |
85.05 |
24.56 |
27.07 |
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Aluminium |
Silicon |
Phosphorus |
Sulfur |
Chlorine |
Argon |
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26.981 538 |
28.085 5 |
30.973 761 |
32.066 |
35.452 7 |
39.948 |
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13 |
Al |
14 |
Si |
15 |
P |
16 |
S |
17 |
Cl |
18 |
Ar |
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[Mg]3p1 |
[Mg]3p2 |
[Mg]3p3 |
[Mg]3p4 |
[Mg]3p5 |
[Mg]3p6 |
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2 698 |
405 |
2 329 |
543 |
1 820 |
331 |
2 086 |
1 046 |
2 030 |
624 |
1 656 |
532 |
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FCC |
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DIA |
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ORC |
1.320 |
ORC |
2.340 |
ORC |
1.324 |
FCC |
|
|
|
|
10 |
11 |
12 |
|
|
|
|
|
3.162 |
|
1.229 |
|
0.718 |
|
|
|
|
|
||||
933.47 |
2 793 |
1 683 |
3 533 |
317.3 |
550 |
388.47 717.82 |
172 |
239.1 |
83.81 |
87.30 |
|
|
|
||||||||
Nickel |
Copper |
Zinc |
Gallium |
Germanium |
Arsenic |
Selenium |
Bromine |
Krypton |
|
|
|
||||||||||
58.693 4 |
63.546 |
65.39 |
69.723 |
72.61 |
74.921 60 |
78.96 |
79.904 |
83.80 |
|
|
|
||||||||||
28 |
Ni |
29 |
Cu |
30 |
|
Zn |
31 |
Ga |
32 |
Ge |
33 |
As |
34 |
Se |
35 |
Br |
36 |
Kr |
|
|
|
[Ca]3d8 |
[Ar]3d104s1 |
[Ca]3d10 |
[Zn]4p1 |
[Zn]4p2 |
[Zn]4p3 |
[Zn]4p4 |
[Zn]4p5 |
[Zn]4p6 |
|
|
|||||||||||
8 907 |
352 |
8 933 |
361 |
7 135 |
|
266 |
5 905 |
452 |
5 323 |
566 |
5 776 |
413 |
4 808 |
(γ) 436 |
3 120 |
668 |
3 000 |
581 |
|
|
|
FCC |
|
FCC |
|
HEX |
1.856 |
ORC |
1.001 |
DIA |
|
RHL 54◦ 7 |
HEX |
1.135 |
ORC |
1.308 |
FCC |
|
|
|
|
||
|
|
1.695 |
|
0.672 |
|
|
|
|
|||||||||||||
1 728 |
3 263 |
1 357.8 |
2 833 |
692.68 |
1 183 |
302.9 |
2 473 |
1211 |
3103 |
883 |
(t-pt) |
493 |
958 |
265.90 |
332.0 |
115.8 |
119.9 |
|
|
|
|
Palladium |
Silver |
Cadmium |
Indium |
Tin |
Antimony |
Tellurium |
Iodine |
Xenon |
|
|
6 |
||||||||||
106.42 |
107.868 2 |
112.411 |
114.818 |
118.710 |
121.760 |
127.60 |
126.904 47 |
131.29 |
|
|
|||||||||||
46 |
Pd |
47 |
Ag |
48 |
|
Cd |
49 |
In |
50 |
Sn |
51 |
Sb |
52 |
Te |
53 |
I |
54 |
Xe |
|
||
[Kr]4d10 |
[Pd]5s1 |
[Pd]5s2 |
[Cd]5p1 |
[Cd]5p2 |
[Cd]5p3 |
[Cd]5p4 |
[Cd]5p5 |
[Cd]5p6 |
|
|
|||||||||||
11 995 |
389 |
10 500 |
409 |
8 647 |
|
298 |
7 290 |
325 |
7 285 (β) 583 |
6 692 |
451 |
6 247 |
446 |
4 953 |
727 |
3 560 |
635 |
|
|
|
|
FCC |
|
FCC |
|
HEX |
1.886 |
TET |
1.521 |
TET |
0.546 |
RHL 57◦ 7 |
HEX |
1.33 |
ORC |
1.347 |
FCC |
|
|
|
|
||
|
|
0.659 |
|
|
|
|
|||||||||||||||
1 828 |
3 233 |
1 235 |
2 433 |
594.2 |
|
1 043 |
429.75 |
2 343 |
505.08 |
2 893 |
903.8 |
1 860 |
723 |
1 263 |
386.7 |
457 |
161.3 |
165.0 |
|
|
|
Platinum |
Gold |
Mercury |
Thallium |
Lead |
Bismuth |
Polonium |
Astatine |
Radon |
|
|
|
||||||||||
195.078 |
196.966 55 |
200.59 |
204.383 3 |
207.2 |
208.980 38 |
[209] |
[210] |
[222] |
|
|
|
||||||||||
78 |
Pt |
79 |
Au |
80 |
|
Hg |
81 |
Tl |
82 |
Pb |
83 |
Bi |
84 |
Po |
85 |
At |
86 |
Rn |
|
|
|
[Xe]4f145d96s1 |
[Xe]4f145d106s1 |
[Yb]5d10 |
[Hg]6p1 |
[Hg]6p2 |
[Hg]6p3 |
[Hg]6p4 |
[Hg]6p5 |
[Hg]6p6 |
|
|
|||||||||||
21 450 |
392 |
19 281 |
408 |
13 546 |
|
300 |
11 871 |
346 |
11 343 |
495 |
9 803 |
475 |
9 400 |
337 |
|
|
440 |
|
|
|
|
FCC |
|
FCC |
|
RHL 70◦ 32 |
HEX |
1.598 |
FCC |
|
RHL 57◦ 14 |
CUB |
|
|
|
|
|
|
|
|
|||
2 041 |
4 093 |
1 337.3 |
3 123 |
234.32 |
|
629.9 |
577 |
1743 |
600.7 |
2 023 |
544.59 |
1 833 |
527 |
1 233 |
573 |
623 |
202 |
211 |
|
|
|
Ununnilium |
Unununium |
Ununbium |
|
|
Ununquadium |
|
|
|
|
|
|
|
|
|
|
|
|||||
[271] |
[272] |
[285] |
|
|
[289] |
|
|
|
|
|
|
|
|
|
|
|
|||||
110 Uun |
111 Uuu |
112 Uub |
|
|
114 |
Uuq |
|
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|
|
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Europium |
Gadolinium |
Terbium |
Dysprosium |
Holmium |
Erbium |
Thulium |
Ytterbium |
Lutetium |
|
|
|||||||||||
151.964 |
157.25 |
158.925 34 |
162.50 |
164.930 32 |
167.26 |
168.934 21 |
173.04 |
174.967 |
|
|
|
||||||||||
63 |
Eu |
64 |
Gd |
65 |
|
Tb |
66 |
Dy |
67 |
Ho |
68 |
Er |
69 |
Tm |
70 |
Yb |
71 |
Lu |
|
|
|
[Ba]4f7 |
[Ba]4f75d1 |
[Ba]4f9 |
[Ba]4f10 |
[Ba]4f11 |
[Ba]4f12 |
[Ba]4f13 |
[Ba]4f14 |
[Yb]5d1 |
|
|
|||||||||||
5 248 |
458 |
7 870 |
363 |
8 267 |
|
361 |
8 531 |
359 |
8 797 |
358 |
9 044 |
356 |
9 325 |
354 |
6 966 (β) 549 |
9 842 |
351 |
|
|
|
|
BCC |
|
HEX |
1.591 |
HEX |
1.580 |
HEX |
1.573 |
HEX |
1.570 |
HEX |
1.570 |
HEX |
1.570 |
FCC |
|
HEX |
1.583 |
|
|
|
|
1 095 |
1 873 |
1 587 |
3 533 |
1 633 |
|
3 493 |
1 683 |
2 833 |
1 743 |
2 973 |
1 803 |
3 133 |
1 823 |
2 223 |
1 097 |
1 473 |
1 933 |
3 663 |
|
|
|
Americium |
Curium |
Berkelium |
Californium |
Einsteinium |
Fermium |
Mendelevium |
Nobelium |
Lawrencium |
|
|
|
||||||||||
[243] |
[247] |
[247] |
[251] |
[252] |
[257] |
[258] |
[259] |
[262] |
|
|
|
||||||||||
95 Am |
96 |
Cm |
97 |
|
Bk |
98 |
Cf |
99 |
Es |
100 |
Fm |
101 |
Md |
102 |
No |
103 |
Lr |
|
|
||
[Ra]5f7 |
[Rn]5f76d17s2 |
[Ra]5f9 |
[Ra]5f10 |
[Ra]5f11 |
[Ra]5f12 |
[Ra]5f13 |
[Ra]5f14 |
[Ra]5f147p1 |
|
|
|||||||||||
13 670 |
347 |
13 510 |
350 |
14 780 |
|
342 |
15 100 |
338 |
|
|
|
|
|
|
|
|
|
|
|
|
|
HEX |
3.24 |
HEX |
3.24 |
HEX |
3.24 |
HEX |
3.24 |
HEX |
|
|
|
|
|
|
|
|
|
|
|
|
|
1 449 |
2 873 |
1 618 |
3 383 |
1 323 |
|
|
1 173 |
|
1 133 |
|
1 803 |
|
1 103 |
|
1 103 |
|
1 903 |
|
|
|
|
126 Solid state physics
6.3 Crystalline structure Bravais lattices
Volume of |
V = (a×b) · c |
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|
|
(6.1) |
a,b,c |
primitive base vectors |
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primitive cell |
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V |
volume of primitive cell |
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|
a = 2πb |
c/[(a |
b) |
· |
c] |
(6.2) |
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× |
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× |
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Reciprocal |
b = 2πc |
a/[(a |
b) |
· |
c] |
(6.3) |
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× |
|
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× |
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a ,b ,c reciprocal primitive base |
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primitive base |
c = 2πa |
b/[(a |
b) |
· |
c] |
(6.4) |
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× |
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× |
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vectors |
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vectorsa |
a · a = b · b = c · c = 2π |
(6.5) |
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|
a · b = a · c = 0 |
|
(etc.) |
(6.6) |
|
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Lattice vector |
Ruvw = ua + vb + wc |
(6.7) |
Ruvw |
lattice vector [uvw] |
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u,v,w |
integers |
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Reciprocal lattice |
Ghkl = ha + kb + lc |
(6.8) |
Ghkl |
reciprocal lattice vector [hkl] |
||||||||||||||
vector |
exp(iGhkl · Ruvw) = 1 |
(6.9) |
i |
i2 = −1 |
||||||||||||||
Weiss zone |
hu+ kv + lw = 0 |
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|
(6.10) |
(hkl) |
Miller indices of planec |
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equationb |
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Interplanar |
dhkl = |
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2π |
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(6.11) |
dhkl |
distance between (hkl) |
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spacing (general) |
Ghkl |
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planes |
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Interplanar |
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1 |
2 |
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2 |
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2 |
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spacing |
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= |
h |
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+ |
k |
+ |
l |
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(6.12) |
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2 |
2 |
2 |
c |
2 |
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(orthogonal basis) |
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dhkl |
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a |
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b |
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aNote that this is 2π times the usual definition of a “reciprocal vector” (see page 20).
bCondition for lattice vector [uvw] to be parallel to lattice plane (hkl) in an arbitrary Bravais lattice.
cMiller indices are defined so that Ghkl is the shortest reciprocal lattice vector normal to the (hkl) planes.
Weber symbols
|
1 |
(2u− v) |
(6.13) |
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U = |
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3 |
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Converting |
1 |
(2v − u) |
|
U,V ,T ,W |
Weber indices |
|||||
V = |
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|
(6.14) |
u,v,w |
zone axis indices |
|||||
[uvw] to |
3 |
|||||||||
[UV T W ] |
1 |
|
|
[UV T W ] |
Weber symbol |
|||||
T = − |
|
(u+ v) |
(6.15) |
[uvw] |
zone axis symbol |
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|
3 |
|||||||||
|
W = w |
(6.16) |
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Converting |
u = (U − T ) |
(6.17) |
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[UV T W ] to |
v = (V − T ) |
(6.18) |
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[uvw] |
w = W |
(6.19) |
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Zone lawa |
hU + kV + iT + lW = 0 |
(6.20) |
(hkil) |
Miller–Bravais indices |
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aFor trigonal and hexagonal systems.
6.3 Crystalline structure |
127 |
|
|
Cubic lattices
lattice |
primitive (P) |
body-centred (I) |
face-centred (F) |
|||||||||||||||
lattice parameter |
a |
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a |
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a |
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volume of conventional cell |
a3 |
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a3 |
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a3 |
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lattice points per cell |
1 |
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2 |
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4 |
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1st nearest neighboursa |
6 |
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8 |
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12 |
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a√ |
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/2 |
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a/√ |
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1st n.n. distance |
a |
3 |
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2 |
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2nd nearest neighbours |
12 |
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6 |
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6 |
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a√ |
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2nd n.n. distance |
2 |
√ |
a |
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√ |
a |
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packing fractionb |
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π/8 |
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π/6 |
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π/6 |
3 |
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2 |
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reciprocal latticec |
P |
|
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F |
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I |
||||||||
primitive base vectorsd |
a1 = axˆ |
a1 = a (yˆ + zˆ |
xˆ ) |
|
a1 = a (yˆ + zˆ) |
|||||||||||||
a2 = ayˆ |
a2 = a |
(zˆ + xˆ |
− yˆ ) |
|
a2 = a (zˆ + xˆ ) |
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2 |
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− |
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2 |
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a |
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a |
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2 |
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2 |
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a3 = azˆ |
a3 = 2 |
(xˆ + yˆ − zˆ) |
|
a3 = 2 (xˆ + yˆ ) |
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aOr “coordination number.” |
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√ |
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bFor close-packed spheres. The maximum possible packing fraction for spheres is |
2 |
π/6. |
cThe lattice parameters for the reciprocal lattices of P, I, and F are 2π/a, 4π/a, and 4π/a respectively. dxˆ , yˆ , and zˆ are unit vectors.
Crystal systemsa |
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6 |
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system |
symmetry |
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unit cellb |
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latticesc |
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triclinic |
none |
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a =b =c; |
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P |
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α =β =γ = 90◦ |
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monoclinic |
one diad |
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[010] |
a =b =c; |
|
= 90◦ |
P, C |
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α = γ = 90◦, β |
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a =b =c; |
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orthorhombic |
three orthogonal diads |
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P, C, I, F |
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α = β = γ = 90◦ |
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tetragonal |
one tetrad |
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[001] |
a = b =c; |
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P, I |
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α = β = γ = 90◦ |
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trigonald |
one triad [111] |
a = b = c; |
|
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P, R |
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|||
α = β = γ < 120◦ = 90◦ |
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hexagonal |
one hexad |
|
[001] |
a = b =c; |
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P |
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α = β = 90◦, γ = 120◦ |
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|||
cubic |
four triads 111 |
a = b = c; |
|
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P, F, I |
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|||
α = β = γ = 90◦ |
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|
aThe symbol “ =” implies that equality is not required by the symmetry, but neither is it forbidden. bThe cell axes are a, b, and c with α, β, and γ the angles between b : c, c : a, and a : b respectively.
cThe lattice types are primitive (P), body-centred (I), all face-centred (F), side-centred (C), and rhombohedral primitive (R).
dA primitive hexagonal unit cell, with a triad [001], is generally preferred over this rhombohedral unit cell.
128 |
Solid state physics |
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|
Dislocations and cracks
Edge |
ˆ |
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ˆ |
unit vector line of |
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l |
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dislocation |
l · b = 0 |
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(6.21) |
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dislocation |
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b,b |
Burgers vectora |
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Screw |
ˆ |
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U |
dislocation energy per |
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(6.22) |
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dislocation |
l · b = b |
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unit length |
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µ |
shear modulus |
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R |
outer cuto for r |
Screw |
2 |
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R |
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U = |
µb |
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ln |
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(6.23) |
r0 |
inner cuto for r |
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dislocation |
4π |
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r0 |
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L |
critical crack length |
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energy per |
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unit lengthb |
µb |
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α |
surface energy per unit |
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area |
Critical crack |
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4αE |
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Young modulus |
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L = |
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σ |
Poisson ratio |
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lengthc |
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π(1 |
− σ |
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p0 |
applied widening stress |
aThe Burgers vector is a Bravais lattice vector characterising the total relative slip were the dislocation to travel throughout the crystal.
bOr “tension.” The energy per unit length of an edge dislocation is also µb2.
cFor a crack cavity (long L) within an isotropic medium. Under uniform stress p0, cracks ≥ L will grow and smaller cracks will shrink.
Crystal di raction
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l
b
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l
r
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L
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a,b,c |
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lattice parameters |
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a(cosα |
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cosα ) = hλ |
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(6.26) |
α |
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angles between lattice base |
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Laue |
1 |
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vectors and input wavevector |
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equations |
b(cosβ1 − cosβ2) = kλ |
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α2,β2,γ2 |
angles between lattice base |
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c(cosγ1 − cosγ2) = lλ |
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vectors and output wavevector |
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h,k,l |
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2kin.G + |G|2 = 0 |
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λ |
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wavelength |
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Bragg’s lawa |
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kin |
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input wavevector |
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G |
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reciprocal lattice vector |
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f(G) |
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atomic form factor |
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Atomic form |
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iG r |
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r |
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position vector |
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factor |
f(G) = vol e− · ρ(r) d |
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ρ(r) |
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atomic electron density |
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Structure |
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n |
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S(G) |
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structure factor |
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S(G) = |
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n |
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number of atoms in basis |
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factorb |
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j=1 |
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d j |
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position of jth atom within basis |
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K |
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change in wavevector |
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Scattered |
I(K ) N |
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|S(K )| |
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intensityc |
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I(K ) |
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scattered intensity |
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N |
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number of lattice points |
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illuminated |
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IT |
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intensity at temperature T |
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Debye– |
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1 |
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I0 |
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intensity from a lattice with no |
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Waller |
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motion |
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IT = I0 exp − 3 u |
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|G| |
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(6.33) |
u2 |
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factord |
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mean-squared thermal |
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displacement of atoms |
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aAlternatively, see Equation (8.32).
bThe summation is over the atoms in the basis, i.e., the atomic motif repeating with the Bravais lattice. cThe Bragg condition makes K a reciprocal lattice vector, with |kin| = |kout|.
dE ect of thermal vibrations.