In situ X-ray Diffraction Study of the Thermal Decomposition of Selenogallates Cs2[Ga2(Se2)2-xSe2+x] (x = 0, 1, 2)

URN to cite this document:: urn:nbn:de:bvb:355-epub-381165
DOI to cite this document:: 10.5283/epub.38116

Friedrich, Daniel

; Schlosser, Marc ; Pfitzner, Arno

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Date of publication of this fulltext: 11 Dec 2018 10:25

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Abstract

The selenogallates CsGaSe3 and Cs2Ga2Se5 release gaseous selenium upon heating. An in situ high-temperature X-ray powder diffraction analysis revealed a two-step degradation process from CsGaSe3 to Cs2Ga2Se5 and finally to CsGaSe2. During each step, one Se-2(2-) unit of the anionic chains in Cs-2[Ga-2(Se-2)(2-x)Se2+x] (x = 0, 1, 2) decomposes, and one equivalent of selenium is released. This ...