Indexed on: 01 May '80Published on: 01 May '80Published in: Russian Physics Journal
A calculation is made of the long-wavelength phonon spectrum of ZnGeP2 and AgGaS2 in the hard ion model. The parameters of short-range forces and dynamic charges are found by comparing the theory with the experimental data on infrared absorption and Raman scattering of light. The elastic and piezoelectric constants are calculated. The available experimental data are discussed.