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The Pauli principle applied to ions with filled shells insures a low electron density
in the region between the two ions where the charge shells make contact. In a
covalent or homopolar bond the charge density between the two atoms may be ...
The difference (6.6) D - E = 4irP is caused by the field 4cirP of the polarization
charge density P on the flat surfaces of the disk cavity; the polarization charges
on the needle cavity may be neglected. Inside a spherical cavity the field is E + ...
The critical frequency is in fact given by, according to our definition, , 1 m n,e2 In,
(11.3b) wc = — - = ^ = > oA nne t m r nn where n, = density of superconducting
electrons, n„ = density of effective normal electrons, and t is the time of relaxation
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LATTICE ENERGY OF IONIC CRYSTALS
ELASTIC CONSTANTS OF CRYSTALS
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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