Abstract
The factors determining the solubility in MMoO4(scheelite)-LnVO4(zircon) systems, where M = Ca, Cd, Sr, Ba, Pb, Ln = Y, Sc, La-Lu, are analyzed. It is shown that primary solid solutions based on REE vanadates are absent due to a high (above 36 kJ/mol) enthalpy of polymorphic scheelite → zircon transition. For solid solutions based on bivalent metal molybdates, the zircon → scheelite transition has a lower enthalpy of 16–22.3 kJ/mol. The differences in bond ionicity in MoO 2−4 and VO 3−4 anions and interatomic distances in MO8 and LnO8 polyhedra restrict mutual solubility of the initial compounds, but are not the cause of its asymmetry.
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Original Russian Text © 2015 V. D. Zhuravlev, O. G. Reznitskikh, V. G. Bamburov.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 56, No. 1, pp. 83–90, January–February, 2015.
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Zhuravlev, V.D., Reznitskikh, O.G. & Bamburov, V.G. On the mutual solubility in MMoO4-LnVO4 systems, where M = Ca, Cd, Sr, Ba, Pb, Ln = Y, Sc, Ce-Lu. J Struct Chem 56, 77–84 (2015). https://doi.org/10.1134/S0022476615010114
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DOI: https://doi.org/10.1134/S0022476615010114