Structural investigation of Pb(MoxW1-x)O4 solid solutions via X-ray and neutron diffractionстатья
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Аннотация:PbMoxW1-xO4 single-crystal solid solutions with x=0.2, 0.5, 0.8 have
been grown by the Czochralski method in air atmosphere from the initial
charge with over-stoichiometric amount of YNb04 (15 wt%). X-ray and
neutron single-crystal and X-ray powder (Rietveld method) diffraction
investigations of PbMoxW1-xO4 crystals indicate bulk inhomogeneity of
their compositions, absence of color centers, and deviation of refined
compositions from initial ones: the Nb5+ and Y3+ contents as well as
oxygen vacancies content increase with increasing x in PbMoxW1-xO4. It
was found that PbMoxW1-xO4 with x=0.2, 0.5, 0.8, 1.0 crystallizes in the
scheelite-type structure with space group I4(1)/a, unlike crystal with
x=0, which is characterized by the symmetry reduction to space group I
(4) over bar caused by ordering of oxygen vacancies. The correlation
between the a and c unit cell parameters and composition of cation
sites, dodecahedral and tetrahedral, and deficiency of oxygen site was
revealed. (C) 2016 Elsevier Ltd. All rights reserved.