Abstract
CuMo3O10⋅H2O crystals have been obtained by hydrothermal synthesis as a result of reaction between (NH4)6Mo2O24⋅4H2O and Cu(CH3COO)2 at 220°C for 7 days. According to X-ray powder diffraction data in a wide temperature range, the studied phase is stable within the range from –180 to 300°С. Its thermal expansion is anisotropic, and thermal expansion coefficients calculated at T = 100°С are αa = 28.5, αb = 6.1, and αc = 13.3°С–1. Structural changes have been tracked by the structure refinement method based on single-crystal X-ray diffraction data obtained at different temperatures. Thermal expansion anisotropy is related to the chain-structure type and angle deformations caused by variations in interatomic angles in the CuO6 octahedron and in interpolyhedral angles between the copper octahedron and trimolybdate chains. The high-temperature behavior of CuMo3O10⋅H2O is compared with that of chemically similar copper molybdates such as lindgrenite, szenicsite, and cupromolybdite.
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ACKNOWLEDGMENTS
We are grateful to S.V. Krivovichev for valuable comments and help in interpreting the experimental data, and also to M.G. Krzhizhanovskaya for advice and assistance during the experiments.
Funding
The study was supported by the Russian Foundation for Basic Research (grant no. 20-35-90007) using the equipment of the Resource Centers of St. Petersburg State University X-ray Diffraction Research and Geomodel.
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Translated by E. Maslennikova
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Ismagilova, R.M., Zhitova, E.S., Zolotarev, A.A. et al. High-Temperature Behavior of the CuMo3O10⋅H2O Compound. Geol. Ore Deposits 64, 676–686 (2022). https://doi.org/10.1134/S1075701522080062
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DOI: https://doi.org/10.1134/S1075701522080062