## Introduction to Solid State Physics |

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Page 82

as the average sound velocity] Crystal T (°C) C (cal/cc) K (cal/cm-deg-sec) A (cm)

Quartzf 0 0.48 0.03 40 X l0-8 -190 0.13 0.12 540 X 10-8 NaCl 0 0.45 0.017 21 ...

**Phonon**Mean Free Path Values [Calculated from (5.37), usiig v = 5 X 105 cm/secas the average sound velocity] Crystal T (°C) C (cal/cc) K (cal/cm-deg-sec) A (cm)

Quartzf 0 0.48 0.03 40 X l0-8 -190 0.13 0.12 540 X 10-8 NaCl 0 0.45 0.017 21 ...

Page 83

They both show that A is proportional to 1/T at high temperatures, in agreement

with experiment. We can understand this dependence in terms of the number of

...

They both show that A is proportional to 1/T at high temperatures, in agreement

with experiment. We can understand this dependence in terms of the number of

**phonons**with which a given**phonon**can interact: at high temperature ICf6 1 I I I 5...

Page 244

in electron-

rep with tpp, we see that under the conditions specified

have considerably shorter relaxation times than

in electron-

**phonon**collisions will be equal to rep as just estimated. Comparingrep with tpp, we see that under the conditions specified

**phonons**in a metal mayhave considerably shorter relaxation times than

**phonons**in a dielectric solid.### What people are saying - Write a review

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### Contents

LATTICE ENERGY OF IONIC CRYSTALS | 29 |

ELASTIC CONSTANTS OF CRYSTALS | 43 |

LATTICE VIBRATIONS | 60 |

Copyright | |

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alkali alloy antiferromagnetic applied approximation atoms axes axis barium titanate boundary Brillouin zones calculated charge coefficient conduction band consider crystal structure cube cubic crystal Curie point curve Debye density diamagnetic dielectric constant diffraction dipole direction discussed dislocation displacement distribution domain effect elastic electric field entropy equation equilibrium experimental F-centers factor Fermi ferroelectric ferromagnetic free electron frequency heat capacity holes impurity interaction ionic crystals ions lattice constant lattice points London low temperatures magnetic field mean free path metals molecules motion nearest neighbor normal observed orbital parallel paramagnetic particles perovskite phonons Phys physical plane polarizability polarization positive potential Proc quantum ratio region resonance result room temperature rotation scattering Seitz shear Shockley shown in Fig simple cubic single crystal sodium chloride solids specimen spin superconducting susceptibility symmetry theory thermal tion unit cell unit volume valence values vector velocity wave functions wavelength x-ray zero