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Kinetics of Thermal Decomposition of Yttrium and Samarium Hydroxides and Sm(OH)3@Y(OH)3 Compound with a Core–Shell Nanostructure

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Abstract

The decomposition mechanisms of hydrated hydroxides of rare-earth metals Sm(OH)3·(H2O)gel·nH2O and Y(OH)3·(H2O)gel·nH2O, and also compound [Sm(OH)3·(H2O)gel·nH2O]q@[Y(OH)3·(H2O)gel·nH2O]p with a core–shell nanostructure were studied. In the course of the thermal treatment of hydroxides in the range of 25–900°C, stages of successive phase transformations were observed. The Avraami-Erofeev model of topochemical reactions describes the formation of phases in the systems under study with the highest correlation coefficient. The kinetics of successive dehydration and dehydroxylation of the above compounds was studied, kinetic equations of the topochemical reactions were presented, and apparent activation energies and the preexponents of the reactions were calculated. The activation energy for polycondensation of the compound with a core-shell nanostructure is lower than that of individual hydrates of samarium and yttrium hydroxides.

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ACKNOWLEDGMENTS

The authors express their gratitude to T.D. Pivovarova (Nikolaev Institute of Inorganic Chemistry SB RAS) for assistance in the synthesis of samarium and yttrium hydroxides and V.A. Logvinenko (Nikolaev Institute of Inorganic Chemistry SB RAS) for assistance in interpreting the results.

Funding

The study was carried out with financial support within the framework of the scientific project of the President of the Russian Federation no. MK-3688.2021.1.3.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russia

    A. V. Sotnikov, V. V. Bakovets & P. E. Plyusnin

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  1. A. V. Sotnikov
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  2. V. V. Bakovets
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  3. P. E. Plyusnin
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Correspondence to A. V. Sotnikov.

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Translated from Zhurnal Obshchei Khimii, 2021, Vol. 91, No. 7, pp. 1108–1119 https://doi.org/10.31857/S0044460X21070155.

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Sotnikov, A.V., Bakovets, V.V. & Plyusnin, P.E. Kinetics of Thermal Decomposition of Yttrium and Samarium Hydroxides and Sm(OH)3@Y(OH)3 Compound with a Core–Shell Nanostructure. Russ J Gen Chem 91, 1368–1378 (2021). https://doi.org/10.1134/S107036322107015X

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