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Thermolysis of Hydrated Antimony Pentoxide

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Inorganic Materials Aims and scope

Abstract—

The thermolysis of hydrated antimony pentoxide (HAP) has been studied in the temperature range from 25 to 1000°C using a variety of experimental techniques: thermogravimetry, X-ray diffraction, pycnometry, elemental microanalysis, and mass spectrometry. The composition and structure of the forming phases have been determined. It has been shown that the initial stages of HAP thermolysis, in the temperature range 24–500°C, include dehydration processes and the formation of anhydrous antimony pentoxide, Sb2O5. At temperatures above 500°C, the process includes oxygen removal, the reduction of Sb(V) to Sb(III), and the formation of Sb6O13 and Sb2O4. The pyrochlore structure of HAP (sp. gr. Fd3m) has been shown to persist in the course of the phase transformations at temperatures below 700°C. Analysis of our experimental data has allowed us to propose a model for crystallographic site occupancies in the pyrochlore-type structure of the phases obtained and determine their temperature stability ranges.

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Authors and Affiliations

  1. Chelyabinsk State University, ul. Brat’ev Kashirinykh 129, 454001, Chelyabinsk, Russia

    L. Yu. Kovalenko, F. A. Yaroshenko, V. A. Burmistrov & T. N. Isaeva

  2. South Ural State University, pr. Lenina 76, 454080, Chelyabinsk, Russia

    D. M. Galimov

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  1. L. Yu. Kovalenko
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  2. F. A. Yaroshenko
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Correspondence to L. Yu. Kovalenko.

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Translated by O. Tsarev

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Kovalenko, L.Y., Yaroshenko, F.A., Burmistrov, V.A. et al. Thermolysis of Hydrated Antimony Pentoxide. Inorg Mater 55, 586–592 (2019). https://doi.org/10.1134/S0020168519060086

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  • DOI: https://doi.org/10.1134/S0020168519060086

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