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Lattice Vibrations and Interatomic Forces in A II B 2 III C 4 VI Defect‐Chalcopyrite Compounds (II). Analysis of Nonpolar Optical Modes
Author(s) -
Neumann H.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280320
Subject(s) - chalcopyrite , ternary operation , scaling law , tetrahedron , chemistry , crystallography , force constant , lattice vibration , lattice (music) , lattice constant , scaling , copper , physics , condensed matter physics , molecule , phonon , geometry , optics , mathematics , organic chemistry , computer science , acoustics , programming language , diffraction
Abstract A simplified version of the Keating model originally derived for defect‐chalcopyrite compounds is extended to include all A II B 2 III C 4 VI compounds with ordered arrays of vacancies. It is shown that the trends and frequencies of the nonpolar optical modes of these compounds can be described within this model. Simple scaling laws for the interatomic force constants are proposed and compared with corresponding relations for other binary and ternary compounds with tetrahedral coordination.