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Crystal structure of double vanadates Ca9 R(VO4)7. II. R = Tb, Dy, Ho, and Y

  • Structure of Inorganic Compounds
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Abstract

Crystal structures of the compounds Ca9 R(VO4)7 (R = Tb (I), Dy (II), Ho (III), and Y (IV) have been studied by the method of the full-profile analysis. All the compounds are crystallized in the trigonal system (sp. gr. R 3 c, Z = 6) with the unit-cell parameters (I) a = 10.8592(1), c = 38.035(1), V = 3884.2(2) Å3; (II) a = 10.8564(1), c = 38.009(1) Å, V = 3879.6(2) Å3, (III) a = 10.8565(1) and c = 37.995(1) Å, V = 3878.3(2) Å3, and (IV) a = 10.8588(1), c = 37.995(1) Å, V = 3879.9(2) Å3. In structures I–IV, rare earth and calcium cations occupy three positions—M(1), M(2), and M(5). Rare earth cations occupy the R 3+ positions almost in the same way: 2.7–2.6(2) cations in the M(1) position; 2.7–2.3(2) cations in the M(2) position, and 0.6–1.0(1) cation in the M(5) position. At the same time, the occupancy of the M(5) position regularly increases with a decrease of the R 3+ radius.

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Authors and Affiliations

  1. Chemistry Department, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia

    A. A. Belik, V. A. Morozov, R. N. Kotov & 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. R. N. Kotov
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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. 3, 2000, pp. 432–437.

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

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Belik, A.A., Morozov, V.A., Kotov, R.N. et al. Crystal structure of double vanadates Ca9 R(VO4)7. II. R = Tb, Dy, Ho, and Y. Crystallogr. Rep. 45, 389–394 (2000). https://doi.org/10.1134/1.171204

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  • DOI: https://doi.org/10.1134/1.171204

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