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KCr3(SO4)2(OH)6: Synthesis, characterization, powder diffraction data, and structure refinement by the Rietveld technique and a compilation of alunite-type compounds

Published online by Cambridge University Press:  10 January 2013

C. L. Lengauer ,
G. Giester  and
E. Irran
C. L. Lengauer*
Affiliation:
Inst.f. Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010 Wien, Austria
G. Giester
Affiliation:
Inst.f. Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010 Wien, Austria
E. Irran
Affiliation:
Inst.f. Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010 Wien, Austria
*
a)Author to whom correspondence should be addressed.
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Abstract

The new compound, KCr3(SO4)2(OH)6, was prepared by low-hydrothermal synthesis. The structure was refined by the Rietveld technique in space group (Z = 3), a =7.2416(3) Å, c = 17.0788(9) Å, V = 775.63 Å3, Rp = 7.7, Rwp =10.1, RB = 6.8. The compound is isotypic with alunite, KAl3(SO4)2(OH)6. The temperature of decomposition under nitrogen atmosphere to a hitherto unknown form is about 550 K. The water content of alunite-type compounds is discussed.

Keywords

KCr3(SO4)2(OH)6Rietveld refinementalunite-type
Type
Research Article
Information
Powder Diffraction , Volume 9 , Issue 4 , December 1994 , pp. 265 - 271
Copyright
Copyright © Cambridge University Press 1994

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