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High-temperature Behavior of PtBi2 and Possibility of Using the Mineral Insizwaite as a Geothermometer

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Abstract

The article presents investigation of polymorphic transformations of the PtBi2 phases that occur during heating in inert atmosphere and in vacuum. A synthetic medium-temperature β-PtBi2 modification corresponding to the mineral insizwaite was studied by high-temperature X-ray diffraction and differential thermal analysis in the temperature range of 20–640°C. Two phase transitions are established by in situ X‑ray powder diffraction: from β into γ-PtBi2, and then into δ-PtBi2. Two endothermic peaks are recorded on the DTA curve, which correspond to the phase transitions. High-temperature X-ray powder diffraction data determined γ- and δ-PtBi2 formation at high temperature in inert atmosphere and in vacuum. Reverse polymorphic transformation were not observed by X-ray powder diffraction during cooling. It is suggested that insizwaite is a mineral geothermometer and its presence in the geological system implies certain temperature ranges of mineral formation environments.

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Funding

The study was carried out under the Russian Government Basic Research Program no. 121041500220-0 granted to the Institute of Geology of Ore Deposits RAS. Thermal analysis and electron-microprobe analysis were carried out at the Geoanalyst Common Use Center UB RAS under the Russian Government Basic Research Program no. AAAA-A19-119071090011-6 granted to the Zavaritsky Institute of Geology and Geochemistry UB RAS. High-temperature X-ray diffraction was performed at the Frumkin Institute of Chemistry and Electrochemistry RAS.

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Authors and Affiliations

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

    A. A. Mezhueva & O. V. Karimova

  2. Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Science, 620110, Ekaterinburg, Russia

    N. S. Uporova

  3. Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 119071, Moscow, Russia

    A. A. Shiryaev

  4. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    D. A. Chareev

  5. Ural Federal University, 620002, Yekaterinburg, Russia

    D. A. Chareev

  6. State University “Dubna”, 141982, Dubna, Moscow region, Russia

    D. A. Chareev

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

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Mezhueva, A.A., Karimova, O.V., Uporova, N.S. et al. High-temperature Behavior of PtBi2 and Possibility of Using the Mineral Insizwaite as a Geothermometer. Geol. Ore Deposits 64, 292–299 (2022). https://doi.org/10.1134/S107570152205004X

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  • DOI: https://doi.org/10.1134/S107570152205004X

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