Lattice dynamics of AgGaS2

G D Holah, J S Webb, H Montgomery

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Raman scattering and infrared reflectivity data are presented for AgGaS2, and they provide fairly complete information on the frequencies of the zone-centre lattice vibrations. Like many ternary semiconductors AgGaS2 has the chalcopyrite structure, and this is treated as a perturbation of the zincblende structure found in binaries such as GaP and ZnS. The probable form of the zine-centre modes in the ternary compounds is studied in detail, partly by considering the form of corresponding modes in the binaries, and partly by drawing a simple analogy with a tetra-atomic linear chain. This leads to the conclusion that in the high-frequency modes of the ternaries both cations are vibrating, in contradiction with previous work. Approximate atomic displacements have been derived for all the zone-centre modes.

Original languageEnglish
Article number010
Pages (from-to)3875-3890
Number of pages16
JournalJournal of Physics C: Solid State Physics
Issue number21
Publication statusPublished - 1974

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    Holah, G. D., Webb, J. S., & Montgomery, H. (1974). Lattice dynamics of AgGaS2. Journal of Physics C: Solid State Physics, 7(21), 3875-3890. [010].