GENESIS OF THE PHONON SPECTRA OF А2B4С52 AND А1В3С62 CRYSTALS WITH A CHALCOPYRITE LATTICE FROM THE VIBRATIONAL STATES OF THEIR SUBLATTICES
A. V. Kopytov, A. S. Poplavnoi, M. K. Ufimtsev
Kemerovo State University, Kemerovo
Keywords: phonon spectrum, lattice dynamics, density of state, sublattices, chalcopyrite
Abstract
The phonon spectra of a series of А2В4С52 and А1В3С62 crystals with the chalcopyrite structure are calculated in the Keating model in the basis set of polarization vectors of their sublattices. The dependences of frequency values and partial contributions of sublattices to the polarization vectors on the chemical composition are studied. The effect of the mass ratio and the strengths of covalent bonds between the compound components on the phonon spectrum formation is found.
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