Acta Crystallographica Section B

Structural Science

Volume 63, Part 2 (April 2007)

research papers

Acta Cryst. (2007). B63, 201-204 [ doi:10.1107/S0108768106049032 ]

Structures of CsEuBr₃ and its degradation product Cs₂EuBr₅·10H₂O

H. Ehrenberg, H. Fuess, S. Hesse, J. Zimmermann, H. von Seggern and M. Knapp

Abstract: CsEuBr₃, caesium europium tribromide, crystallizes in an orthorhombic perovskite-type structure with an a^-a^-c⁺ octahedral tilting scheme (GdFeO₃ type). CsEuBr₃ is unstable in air and one of the degradation products was identified as Cs₂EuBr₅·10H₂O by single-crystal X-ray analysis and synchrotron powder diffraction. The Eu³⁺ ions on twofold rotational axes are coordinated by nine water molecules, and each water O atom is linked to two Br atoms by hydrogen bonds. The tricapped trigonal [EuO₉] prisms are separated from each other by infinite {Cs₂Br₅·H₂O} chains; the description Eu(OH₂)₉Cs₂Br₅(OH₂) might therefore be more appropriate. The oxidation of Eu²⁺ to Eu³⁺ during the degradation of CsEuBr₃ is further confirmed by changes in the magnetic properties from the as-prepared material into the degraded product.

Keywords: degradation; tilting scheme; magnetic properties.


	Structure factor file (CIF format) (53.3 kbytes) [ doi:10.1107/S0108768106049032/ws5050k4mxpsup2.fcf ] Contains datablock {g:\sc\sabine~1\k4\shelx\k4mxp}

	Structure factor file (CIF format) (124.8 kbytes) [ doi:10.1107/S0108768106049032/ws5050k1mascsup3.fcf ] Contains datablock {g:\sc\sabine~1\sh_310s\k1\shelx\k1masc}

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