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Thermal Transformation of a Synthetic Analogue of Insizwaite PtBi2 on Air

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Abstract

High-temperature transformation of β-PtBi2, a synthetic analogue of insizwaite, was studied under oxidizing conditions (on air). The behavior of the sample upon heating up to 660°C and cooling was studied by differential thermal analysis (DTA) and high-temperature X-ray powder diffraction. It was shown that polymorphic transitions of β-PtBi2 into high-temperature γ- and δ-polymorphs do not occur under thermal treatment in the oxidizing conditions (on air). The DTA curve shows two exothermic peaks at 318 and 620°C. The total weight change in the temperature range studied is +10.5%. No thermal reactions or weight changes were recorded upon cooling of the sample. According to the high-temperature diffraction experiment in situ, the decomposition of the synthesized phase into Pt and Bi was recorded with their subsequent oxidation to bismuth oxide Bi2O3 with the bismite-type structure and double platinum and bismuth oxide with the pyrochlore-type structure Bi2Pt2O7. The study by electron microprobe analysis showed that the grains of the transformed insizwaite are a finely dispersed mixture of two oxides.

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Funding

This study was carried out as a part of a State Assignment, project no. 121041500220-0, of the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences. The synthesis was supported by a Grant of the President of the Russian Federation for state support of leading scientific schools of the Russian Federation, project no. NSh-2394.2022.1.5. Thermoradiography was conducted on the equipment of the Center for Collective Use, Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences. Analytical data of electron microprobe analysis were obtained at the Laboratory for Local Methods of the Study of Matter (Department of Petrology and Volcanology, Faculty of Geology, Moscow State University) using a Superprobe JEOL JXA-8230 electron microprobe purchased with funds from the Moscow University Development Program.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    A. A. Mezhuyeva & O. V. Karimova

  2. Moscow State University, 119991, Moscow, Russia

    N. G. Zinovieva

  3. Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    N. S. Uporova

  4. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Shiryaev

  5. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    D. A. Chareev

  6. Ural Federal University, 620002, Yekaterinburg, Russia

    D. A. Chareev

  7. Dubna State University, 141982, Dubna, Moscow oblast, Russia

    D. A. Chareev

Authors
  1. A. A. Mezhuyeva
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  2. O. V. Karimova
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  3. N. G. Zinovieva
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  4. N. S. Uporova
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  5. A. A. Shiryaev
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  6. D. A. Chareev
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Correspondence to A. A. Mezhuyeva or O. V. Karimova.

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Translated by A. Bobrov

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Mezhuyeva, A.A., Karimova, O.V., Zinovieva, N.G. et al. Thermal Transformation of a Synthetic Analogue of Insizwaite PtBi2 on Air. Dokl. Earth Sc. 506, 740–748 (2022). https://doi.org/10.1134/S1028334X22600529

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  • DOI: https://doi.org/10.1134/S1028334X22600529

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