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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| Authors: | G. M. Kuz'micheva E. V. Zharikov K. A. Subbotin D. A. Lis V. B. Rybakov |
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| Affiliation: | (1) Lomonosov State Academy of Fine Chemical Technology, pr. Vernadskogo 86, Moscow, 119571, Russia;(2) Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125820, Russia;(3) Prokhorov Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia;(4) Moscow State University, Vorob'evy gory 1, Moscow, 119899, Russia |
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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. I1/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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