期刊
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
卷 63, 期 -, 页码 201-204出版社
BLACKWELL PUBLISHING
DOI: 10.1107/S0108768106049032
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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 . 10H(2)O 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)(9)Cs2Br5(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.
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