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Crystal growth of argyrodite-type phases Cu8–xGeS6−xIx and Cu8–xGeSe6−xIx (0⩽x⩽0.8) by Yvonne Tomm; Susan Schorr; Sebastian Fiechter is a Engineering article available to read on EtoBox.

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The growth of single crystalline argyrodites of type Cu 8Àx GeX 6Àx Y x (X 1⁄4 S, Se; Y 1⁄4 I) is reported. These materials undergo solid-solid phase transitions at temperatures ranging from 30 to 90 1C. In the high temperature phase, Cu 8 GeS 6 crystallizes in the cubic space group F4 ̄3m. In the low temperature phase, the compound is present in the orthorhombic space group Pmn2 1 . Cu 8 GeSe 6 appears exclusively in the hexagonal space groups P6 3 mc or P6 3 cm, respectively. Single crystals of these argyrodites were obtained by chemical vapor transport in a temperature gradient DT 1⁄4 980À950 and DT 1⁄4 700À620 1C for sulfides and selenides, respectively. As a result of the growth process, the high temperature phase remains stable even at ambient temperature by incorporation of the transport agent iodine during the growth process. As determined by energy dispersive X-ray analysis (EDAX), the composition of the sulfide crystals grown ranges from Cu 8 GeS 6 to Cu 7.16 GeS 5.16 I 0.84 . The selenide crystallizes as Cu 7.69 GeSe 5.69 I 0.31 . In contrast, the solid state reaction of the elements Cu, Ge and X produces a material in the low temperature modification with an ideal comp

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Author

Yvonne Tomm; Susan Schorr; Sebastian Fiechter

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-0248)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)