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The early days of lattice dynamics
A Phonon dispersion curves
73 other sections not shown
absorption acoustic alkali halides anharmonic approximation atoms band branches Bravais lattice Brillouin zone calculated charge Chem coefficients contribution corresponding coupling critical points crystal cubic Debye defect density dependence derived determined diamond dielectric dielectric constant dipole direction discussed dispersion curves dispersion relations displacement effect elastic constants electron expression factor force constants Fourier frequency germanium given Green's function harmonic impurity inelastic infrared interactions ionic lattice dynamics lattice vibrations linear localized modes Maradudin mass matrix measurements ment metals method NaCl nearest neighbor neighbours neutron scattering normal modes observed obtained one-phonon optical parameters particle peaks perturbation phonon Phys Physics plane polarization potential energy Proc quency Raman second-order shell model shown silicon solid specific heat spectra spectrum stants structure surface symmetry Table temperature theoretical theory thermal tion transverse two-phonon unit cell values wave vector wurtzite zero