Infrared spectroscopy and the structure of rare-earth chromium borates RCr3(BO3)4 (R = La-Er)

被引:0
|
作者
V. S. Kurazhkovskaya
E. A. Dobretsova
E. Yu. Borovikova
V. V. Mal’tsev
N. I. Leonyuk
机构
[1] M. V. Lomonosov Moscow State University,
来源
Journal of Structural Chemistry | 2011年 / 52卷
关键词
IR spectroscopy; factor group analysis; rare-earth chromium borates;
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摘要
Rare-earth chromium borates RCr3(BO3)4, where R = La-Er, obtained as a result of spontaneous solutionmelt crystallization and belonging to two polytypic modifications (R32 (D37) and C2/c (C2h6) space groups) are studied by infrared spectroscopy with the factor group analysis of vibrations. Borates with R = La-Nd are shown to crystallize in the monoclinic C2/c space group. Borates with R = Sm-Er in the 1:1 ratio of batch and solvent form rhombohedral (R32 space group) and monoclinic (C2/c space group) phases at the 2.3:1 ratio, except EuCr3(BO3)4 and GdCr3(BO3)4 that have the rhombohedral structure under all crystallization conditions. Both rhombohedral and monoclinic polytypes may contain oppositely ordered layers. Y-, Tm-, Yb-, Lu-chromium borates are not formed.
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页码:699 / 707
页数:8
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