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Pressure-Induced Phase Transitions in Cadmium Thiogallate CdGa2Se4

✍ Scribed by A. Grzechnik; V.V. Ursaki; K. Syassen; I. Loa; I.M. Tiginyanu; M. Hanfland

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
376 KB
Volume
160
Category
Article
ISSN
0022-4596

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✦ Synopsis

The high-pressure behavior of semiconducting cadmium thiogallate CdGa 2 Se 4 with the defect chalcopyrite structure (I4 , Z ‫؍‬ 2) is studied by in situ angle-dispersive synchrotron X-ray powder di4raction and optical re6ectivity measurements in a diamond anvil cell at room temperature. At 21 GPa an or-der+disorder phase transition to the rock-salt structure (F4 3m, Z ‫؍‬ 4) occurs. Upon decompression, the metallic NaCltype polymorph transforms into zinc-blende (Fm3 m, Z ‫؍‬ 4) at pressures of 7.5+4 GPa. The recovered metastable semiconducting material is of the zinc-blende type.

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