Anomalous behaviours of two phonon peaks observed in ZnGa2S4single crystals grown by an iodine-transport technique
✍ Scribed by T. W. Kim; H. L. Park; S. I. Radaustau; I. M. Tiginyanu; Y. O. Derid
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 173 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0261-8028
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✦ Synopsis
ZnGazS4 is a tetrahedrally bonded semiconductor compound, and its crystal structure may be regarded as being derived from that of zincblende by the incorporation of an ordered array of vacancies [1]. This ordering leads to a double stacking of the zincblende unit cells along the c-axis, thus forming a superstructure. The formula can be written as ZnGa2xS4, with x denoting the vacancy. If the vacancy is treated as an atom of zero valence, the Grimm-Sommerfeld rule, which demands an average of four valence electrons per atom, is satisfied [2]. There is still some uncertainty as to the space groups of ZnGazS4 . The original structure of ZnGa2S4 was reported by Hahn et al. [3], and they suggested two possible space groups, that is, 14 and