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X-ray Diffraction Study of the Structure and Defect System of Nominally Pure and Er3+- and Ce3+-Activated (Na0.5La0.5)MoO4 Crystals

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Abstract

Nominally pure and activated (Er3+ and Er3+ + Ce3+) sodium lanthanum molybdate single crystals grown by the Czochralski technique from the (Na0.5La0.5)MoO4 melt in different environments and then oxidized in air at 100°C are characterized in detail by x-ray diffraction (lattice parameters and structure refinement by the Rietveld method and single-crystal techniques). The results confirm that (Na0.5La0.5)MoO4 crystallizes in a tetragonal scheelite structure (sp. gr. I 1/a). The crystals (especially unannealed crystals grown in neutral atmosphere) are shown to contain oxygen vacancies. In addition, some of the samples contain Mo vacancies. The Er3+ distribution over some of the activated crystals is highly inhomogeneous. As a result, the crystals contain Er-enriched zones with a distorted scheelite structure.

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Authors and Affiliations

  1. Lomonosov State Academy of Fine Chemical Technology, pr. Vernadskogo 86, Moscow, 119571, Russia

    G. M. Kuz'micheva

  2. Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125820, Russia

    E. V. Zharikov

  3. Prokhorov Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    K. A. Subbotin & D. A. Lis

  4. Moscow State University, Vorob'evy gory 1, Moscow, 119899, Russia

    V. B. Rybakov

Authors
  1. G. M. Kuz'micheva
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  2. E. V. Zharikov
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  3. K. A. Subbotin
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  4. D. A. Lis
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  5. V. B. Rybakov
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__________

Translated from Neorganicheskie Materialy, Vol. 41, No. 9, 2005, pp. 1133–1145.

Original Russian Text Copyright © 2005 by Kuz'micheva, Zharikov, Subbotin, Lis, Rybakov.

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Kuz'micheva, G.M., Zharikov, E.V., Subbotin, K.A. et al. X-ray Diffraction Study of the Structure and Defect System of Nominally Pure and Er3+- and Ce3+-Activated (Na0.5La0.5)MoO4 Crystals. Inorg Mater 41, 998–1009 (2005). https://doi.org/10.1007/s10789-005-0252-4

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  • DOI: https://doi.org/10.1007/s10789-005-0252-4

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