Abstract
AbstractA short‐range force constant model (SRFCM) was applied to investigate the phonons in AGa2X4 (A = Cd, Zn; X = S, Se) defect chalcopyrite compounds in the tetragonal phase. The calculation with six stretching and one bending force constants in the SRFCM agrees well with the observed Raman and infrared wavenumbers. In CdGa2X4, the nearest Ga—X interatomic force constants of its bonds were found to be stronger than the nearest Cd—X interatomic force constants, whereas in ZnGa2X4, the nearest Zn—X interatomic force constants of its bonds were found to be weaker than the nearest Zn—X interatomic force constants. The variation of interatomic force constants is discussed. The dominant force constants have nearly the same ratio when Se replaces S. Copyright © 2003 John Wiley & Sons, Ltd.
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