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Synthesis and thermal stability of rare-earths molybdates and tungstates with fluorite- and scheelite-type structure

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Abstract

Polycrystalline samples of rare-earths molybdates and tungstates, i.e., CdRE4Mo3O16 (RE = Eu, Gd, Y, Ho) and Pb1–3x□xEu2xWO4 (0 < x ≤ 0.1296 and □ denotes cationic vacancies) have been successfully prepared by high-temperature annealing of adequate CdMoO4/RE2MoO6 and PbWO4/Eu2(WO4)3 mixtures, respectively. According to the X-ray diffraction analysis, the CdRE4Mo3O16 compounds crystallize in a cubic, fluorite-related-type structure with space group \(Pn\bar{3}n\). In turn, new Pb1–3x□xEu2xWO4 phases crystallize in the scheelite-type, tetragonal symmetry, space group I41/a. Cadmium and rare-earth molybdates decompose in the solid state and the solid products of their decomposition are two RE molybdates, i.e., RE2MoO6 and RE2(MoO4)3. Thermal stability of CdRE4Mo3O16 decreases with decreasing of RE3+ radius. The melting point of each sample of Pb1–3x□xEu2xWO4 solid solution is lower than melting point of pure matrix, i.e., PbWO4 (1116 °C), and it decreases with increasing in Eu content. Both CdRE4Mo3O16 as well as Pb1–3x□xEu2xWO4 samples are insulators, and their optical band gap (E g) is bigger than 3 eV.

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Authors and Affiliations

  1. Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 42, 71-065, Szczecin, Poland

    Marta Pawlikowska, Magdalena Piątkowska & Elżbieta Tomaszewicz

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  1. Marta Pawlikowska
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  2. Magdalena Piątkowska
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  3. Elżbieta Tomaszewicz
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Correspondence to Elżbieta Tomaszewicz.

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Pawlikowska, M., Piątkowska, M. & Tomaszewicz, E. Synthesis and thermal stability of rare-earths molybdates and tungstates with fluorite- and scheelite-type structure. J Therm Anal Calorim 130, 69–76 (2017). https://doi.org/10.1007/s10973-017-6127-5

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