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

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Abstract

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 (D 73 ) and C2/c (C 62h ) 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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Authors and Affiliations

  1. M. V. Lomonosov Moscow State University, Moscow, Russia

    V. S. Kurazhkovskaya, E. A. Dobretsova, E. Yu. Borovikova, V. V. Mal’tsev & N. I. Leonyuk

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  1. V. S. Kurazhkovskaya
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  2. E. A. Dobretsova
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  3. E. Yu. Borovikova
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  4. V. V. Mal’tsev
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  5. N. I. Leonyuk
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Correspondence to V. S. Kurazhkovskaya.

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Original Russian Text Copyright © 2011 by V. S. Kurazhkovskaya, E. A. Dobretsova, E. Yu. Borovikova, V. V. Mal’tsev, and N. I. Leonyuk

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Translated from Zhurnal Strukturnoi Khimii, Vol. 52, No. 4, pp. 721–729, July–August, 2011.

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Kurazhkovskaya, V.S., Dobretsova, E.A., Borovikova, E.Y. et al. Infrared spectroscopy and the structure of rare-earth chromium borates RCr3(BO3)4 (R = La-Er). J Struct Chem 52, 699–707 (2011). https://doi.org/10.1134/S0022476611040081

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  • DOI: https://doi.org/10.1134/S0022476611040081

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