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The Crystalline State
The Speciﬁc Heat of Solids and Lattice Vibrations
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absorption according alkali halides alloys applied ﬁeld approximation assume atoms Brillouin zone calculated coefﬁcient conduction band conﬁguration consider corresponding cubic Curie Curie temperature curve Debye deﬁned density dielectric constant diffusion dipole dipole moment direction discussed dislocation line displacement distance divalent edge dislocation electric ﬁeld emission entropy equal equation equilibrium example experimental expression external ﬁeld Fermi level ferroelectric ferromagnetic ﬁnds ﬁrst ﬂow free electron Frenkel defect frequency given impurities inﬂuence interaction interstitial ionic crystals lattice magnetic ﬁeld metals molecule N. F. Mott NaCl negative ion vacancy number of electrons obtained ofthe paramagnetic particles photon Phys physical polarizability positive ion vacancy potential energy refer reﬂection region represented result Rochelle salt satisﬁed semiconductor solid speciﬁc heat spin spontaneous polarization structure surface temperature theory thermal transition unit cell unit volume valence valence band velocity vibrations wave functions wave vector zero