Thermal Transformation of a Synthetic Analogue of Insizwaite PtBi2 on Air

Mezhueva, A.A.; Karimova, O.V.; Zinovieva, N.G.; Uporova, N.S.; Shiryaev, A.A.; Chareev, D.A.

Авторы: Mezhueva A.A., Karimova O.V., Zinovieva N.G., Uporova N.S., Shiryaev A.A., Chareev D.A.
Журнал: Doklady Earth Sciences
Том: 506
Номер: 2
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 740
Последняя страница: 748
DOI: 10.1134/S1028334X22600529
Аннотация: 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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