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8. Single-Crystal X-Ray Diffraction Study on Structural Change of AgGaS2with Increasing Pressure

Author

Ishizawa, Nobuo, Kitahara, Hiromi, Komori, Takashi, Noda, Yasutoshi, and Marumo, Fumiyuki

Abstract

Single-crystal X-ray diffraction study under high pressures has been carried out on silver thiogallate, AgGaS2, to investigate the phase transition at about 42 kbar. The crystal of AgGaS2is tetragonal with the space group I2d having the cell dimensions a=5.7603(6) and c=10.299(2) Å under the ambient pressure. The high-pressure form has a similar unit cell to that of the ambient pressure form. The diffraction pattern around the [22] zone axis at 47 kbar indicated that the high pressure form has weak but clear hhlreflections which do not satisfy the systematic absence condition, 2h+l=4n, for the space group I2d. It has been concluded that the diamond glide planes parallel to {110} present in the ambient pressure form disappear in the high pressure form.

Published
1993
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