Influence of tellurium impurity on the phase transitions and thermal behavior of synthetic Te-bearing insizwaite Pt(Bi,Te)2

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Abstract

The effect of tellurium impurity on high-temperature transformations in the synthetic phase Pt(Bi,Te)2, which is an analogue of the mineral insizwaite, was studied using high-temperature in-situ methods. The empirical formula of the studied compound is Pt1.04(Bi1.74Te0.22)1.96. According to the differential thermal analysis (DTA + TG) and high temperature X-ray diffraction data, two polymorphic transformations were found for the Pt(Bi,Te)2 phase. The temperatures of phase transitions were slightly shifted compared to the values for the PtBi2 phase. The phase transition from the cubic β-modification to the hexagonal γ-modification of Pt(Bi,Te)2 occurs at a temperature of 523 °C, which is 100 °C higher than in the PtBi2 phase without tellurium impurity. The γ-Pt(Bi,Te)2 is transformed into the high-temperature δ-modification at a temperature of 626 °C, close to the temperature of a similar transition in PtBi2. The isomorphic tellurium impurity in the structure of PtBi2 expands stability field under the influence of high temperatures for its cubic β-modification, which is corresponding to the mineral insizwaite. On the contrary, the stability field of the γ-modification is reduced in the presence of tellurium impurity.

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About the authors

A. A. Mezhueva

Institute of Geology of Ore Deposits, RAS

Author for correspondence.
Email: ann_mezhueva@mail.ru
Russian Federation, Moscow

O. V. Karimova

Institute of Geology of Ore Deposits, RAS

Email: oxana.karimova@gmail.com
Russian Federation, Moscow

N. S. Uporova

Institute of Geology and Geochemistry, Urals Branch RAS

Email: oxana.karimova@gmail.com
Russian Federation, Ekaterinburg

A. A. Shiryaev

Institute of Physical chemistry and Electrochemistry Russian academy of sciences

Email: oxana.karimova@gmail.com
Russian Federation, Moscow

L. A. Ivanova

Institute of Geology of Ore Deposits, RAS

Email: oxana.karimova@gmail.com
Russian Federation, Moscow

P. V. Chareeva

Institute of Geology of Ore Deposits, RAS

Email: oxana.karimova@gmail.com
Russian Federation, Moscow

D. A. Chareev

Institute of Experimental Mineralogy, Russian Academy of Sciences; Ural Federal University; Dubna State University

Email: oxana.karimova@gmail.com
Russian Federation, Chernogolovka; Ekaterinburg; Dubna

References

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Supplementary files

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2. Fig. 1. Image of a grain of the synthetic phase Pt(Bi,Te)2 with the designation of the EDS analyses profiles.

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3. Fig. 2. X-ray diffraction pattern of Pt(Bi,Te)2.

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4. Fig. 3. DTA temperature dependences of a PtBi2 sample obtained in the mode of heating and subsequent cooling in an argon atmosphere at scanning rate of 10 °C/min.

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5. Fig. 4. DTA temperature dependences of a Pt(Bi,Te)2 sample obtained in the mode of heating and subsequent cooling in an argon atmosphere at a scanning rate of 10 °C/min.

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6. Fig. 5. High-temperature X-ray diffraction patterns of Pt(Bi,Te)2 obtained in the temperature range from 25 °C to 680 °C in vacuum.

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7. Fig. 6. High-temperature X-ray diffraction patterns of Pt(Bi,Te)2 obtained in the temperature range from 680 °C to 30 °C in vacuum.

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8. Fig. 7. Thermal expansion of the unit cell parameters for PtBi2 according to data from (Mezhueva et al., 2022a) (orange square) and Pt(Bi,Te)2 (blue circle) in the temperature range from 25 to 520 °C.

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