## Introduction to Solid State Physics |

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Page 72

ENERGY OF A HARMONIC OSCILLATOR

elementary result of

oscillator of angular frequency co may be written (5.4) Wn = nho>, where n is the

ENERGY OF A HARMONIC OSCILLATOR

**QUANTUM**THEORY It is anelementary result of

**quantum**theory that the energy levels of a harmonicoscillator of angular frequency co may be written (5.4) Wn = nho>, where n is the

**quantum**...Page 162

The physical origin of the Weiss field is in the

integral, as pointed out by Heisenberg (1928). On certain assumptions it can be

shown' that the energy of interaction of atoms i, j bearing spins <S,-, contains a

term ...

The physical origin of the Weiss field is in the

**quantum**-mechanical exchangeintegral, as pointed out by Heisenberg (1928). On certain assumptions it can be

shown' that the energy of interaction of atoms i, j bearing spins <S,-, contains a

term ...

Page 225

centration of valence electrons is 10* higher than the concentration of molecules

in a gas at S.T.P. Under these conditions classical statistics is no longer a valid

approximation to the correct

...

centration of valence electrons is 10* higher than the concentration of molecules

in a gas at S.T.P. Under these conditions classical statistics is no longer a valid

approximation to the correct

**quantum**statistics. As applied to electrons,**quantum**...

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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