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X-ray Diffraction Study of the Structure and Defect System of Yb-Activated (Na0.5Gd0.5)WO4 Crystals

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Inorganic Materials Aims and scope

Abstract

Nominally pure and Yb-activated Czochralski-grown (Na0.5Gd0.5)WO4 crystals (scheelite type) were studied by x-ray diffraction (phase analysis, unit-cell parameters, and structure refinement by the Rietveld method and single-crystal techniques). A pseudotetragonal (orthorhombic) superstructure was revealed, which was shown to have doubled unit-cell parameters compared to the scheelite cell. Some of the crystals were found to contain tungsten and oxygen vacancies, which give rise to additional optical absorption. The effects of the growth and heat-treatment conditions and Yb activation on the structure, defect system, and additional absorption spectrum of (Na0.5Gd0.5)WO4 are analyzed.

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Authors and Affiliations

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

    E. V. Zharikov

  2. Lomonosov State Academy of Fine Chemical Technology, pr. Vernadskogo 87, Moscow, 117571, Russia

    G. M. Kuz'micheva

  3. Research Center for Laser Materials and Technology, Prokhorov Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    D. A. Lis, Yu. M. Papin, B. A. Smirnov & K. A. Subbotin

  4. Moscow State University, Moscow, 119899, Russia

    V. B. Rybakov

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  1. E. V. Zharikov
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  2. G. M. Kuz'micheva
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  3. D. A. Lis
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  7. K. A. Subbotin
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Zharikov, E.V., Kuz'micheva, G.M., Lis, D.A. et al. X-ray Diffraction Study of the Structure and Defect System of Yb-Activated (Na0.5Gd0.5)WO4 Crystals. Inorganic Materials 39, 151–160 (2003). https://doi.org/10.1023/A:1022146629652

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