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Synthesis and Thermodynamic Properties of the Ln2CrTaO7 (Ln = Sm, Gd, Y) Pyrochlores

  • SYNTHESIS AND PROPERTIES OF INORGANIC COMPOUNDS
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Abstract

Ln2CrTaO7 (Ln = Sm, Gd, Y) pyrochlores are synthesized by the co-precipitation with subsequent annealing. The effect of the precursor composition ((NH4)2Cr2O7, Cr(NO3)3, and CrCl3) on the precipitates reactivity and product microstructure was studied. Samples with an average particle size of 200 nm for Y2CrTaO7, 450 nm for Gd2CrTaO7 and 600 nm for Sm2CrTaO7 were used to study thermodynamic properties. The temperature dependences of heat capacity were measured by the adiabatic calorimetry (13–346.16 K) method and the ratio method using DSC measurements (330–1300 K). The thermodynamic functions of Ln2CrTaO7 compounds were calculated. The absence of polymorphic transitions up to a temperature of 1450°C for all studied compounds is shown.

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ACKNOWLEDGMENTS

The investigations were carried out using the facilities of the Center for Collective Use of the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences.

Funding

This study was financially supported by the Russian Science Foundation (project no. 18-13-00025).

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    A. V. Egorysheva, E. F. Popova, A. V. Tyurin & A. V. Khoroshilov

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  1. A. V. Egorysheva
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  2. E. F. Popova
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  3. A. V. Tyurin
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  4. A. V. Khoroshilov
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Correspondence to A. V. Egorysheva.

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Egorysheva, A.V., Popova, E.F., Tyurin, A.V. et al. Synthesis and Thermodynamic Properties of the Ln2CrTaO7 (Ln = Sm, Gd, Y) Pyrochlores. Russ. J. Inorg. Chem. 66, 1649–1659 (2021). https://doi.org/10.1134/S003602362111005X

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