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Crystal structures of double vanadates, Ca9 R(VO4)7 ⋅ III. R = Nd, Sm, Gd, or Ce

  • Structures of Inorganic Compounds
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Abstract

The crystal structures of Ca9 R(VO4)7 (R = Nd (I), Sm (II), or Gd (III)) were studied by the Rietveld method. The compounds are isostructural to Ca3(VO4)2 and are crystallized in the trigonal system (sp. gr. R3c, Z = 6). The unit-cell parameters are as follows: for I, a = 10.8720(5) Å, c = 38.121(1) Å; for II, a = 10.8652(5) Å, c = 38.098(1) Å; and for III, a = 10.8631(5) Å, c = 38.072(1) Å. In the structures of I and II, the M(1), M(2), and M(3) positions are statistically occupied by the rare-earth cations and calcium anions. In the structure of III, the Gd3+ cations occupy the M(1) and M(2) positions. The distributions of the R 3+ cations over the positions are characteristic of each structure. The composition of the cerium-ontaining compound Ca9.81Ce0.42(VO4)7 (a = 10.8552(5) Å, c = 38.037(1) Å) was refined and its crystal structure was solved from the X-ray powder data. In this compound, cerium atoms are in the oxidation states +3 and +4.

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Authors and Affiliations

  1. Department of Chemistry, Moscow State University, Vorob’evy gory, Moscow, 117234, Russia

    A. A. Belik, V. A. Morozov, S. V. Grechkin & B. I. Lazoryak

  2. Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    S. S. Khasanov

Authors
  1. A. A. Belik
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  2. V. A. Morozov
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  3. S. V. Grechkin
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  4. S. S. Khasanov
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  5. B. I. Lazoryak
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Translated from Kristallografiya, Vol. 45, No. 5, 2000, pp. 798–803.

Original Russian Text Copyright © 2000 by Belik, Morozov, Grechkin, Khasanov, Lazoryak.

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Belik, A.A., Morozov, V.A., Grechkin, S.V. et al. Crystal structures of double vanadates, Ca9 R(VO4)7 ⋅ III. R = Nd, Sm, Gd, or Ce. Crystallogr. Rep. 45, 728–733 (2000). https://doi.org/10.1134/1.1312910

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  • DOI: https://doi.org/10.1134/1.1312910

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