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Raman study of cation distribution in the scheelite-like double molybdates and tungstates

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Abstract

Compounds M+ M3+ (TO4)2 have been investigated (M+, M3+ are alkaline and rare earth metals, respectively; T=Mo, W). The way of cation distribution (statistical or orderec) is given by the ratio of their ionic radii. The boundary between the distributions has been determinea: r ion (M+)/r ion (M3+)=1.3–1.32. In molybdates the cations are partly ordered even when M+ and M3+ have close dimensions because they interact with each other. The compounds KLa(MoO4)2 and KN l(MoO4)2 fall within the transition range and have, therefore, a complex polymorphic composition. The phase transition from the high-to low-temperature form of KLa(MoO4)2 is identical to the corresponding transition in KEu(MoO4)2 known from X-ray studies.

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Authors
  1. B. A. Kolesov
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  2. L. P. Kozeeva
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Additional information

Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Struktumoi Khimii, Vol. 34, No. 4, pp. 42–58, July–August, 1993.

Translated by L. Smolina

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Kolesov, B.A., Kozeeva, L.P. Raman study of cation distribution in the scheelite-like double molybdates and tungstates. J Struct Chem 34, 534–539 (1994). https://doi.org/10.1007/BF00753521

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  • DOI: https://doi.org/10.1007/BF00753521

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