Polymorphie von Cs3Tl2Br9

Cs Tl Br , which has been synthesized either by heating a 3:2 mixture of CsBr/TlBr with bromine in a closed system or by reaction of these components in aqueous solutions, shows dimorphism. The phase transition (170 °C) was characterized by thermal analysis and X-ray diffraction. The low temperature...

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Published inZeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 42; no. 7; pp. 818 - 824
Main Authors Zimmermann, Klaus, Thiele, Gerhard
Format Journal Article
LanguageEnglish
Published Verlag der Zeitschrift für Naturforschung 01.07.1987
Subjects
Bromothallate
Crystal Structure
Raman Spectra
Thallium
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Summary:Cs Tl Br , which has been synthesized either by heating a 3:2 mixture of CsBr/TlBr with bromine in a closed system or by reaction of these components in aqueous solutions, shows dimorphism. The phase transition (170 °C) was characterized by thermal analysis and X-ray diffraction. The low temperature modification α-Cs TlBr crystallizes in the monoclinic space group P2 /m (a = 964.98(9), b = 779.49(7), c = 1382.16(13) pm, β = 92.68(1)°, Z = 2). The structure is built up from TlBr octahedra linked by sharing vertices to chains and isolated TlBr tetrahedra. The high tem perature modification β-Cs Tl Br represents the undistorted trigonal Cs Bi Br -type structure (a = 796.80(8), c - 982.98(15) pm).
ISSN:0932-0776
1865-7117
DOI:10.1515/znb-1987-0704