Structural transformations and phase transition froodite (α–PdBi2) — urvantsevite (β–PdBi2) at high temperature
https://doi.org/10.55959/MSU0579-9406-4-2025-64-1-3-9
Abstract
The phase transition in the structure of the PdBi2 compound was studied using high-temperature in-situ methods (differential thermal analysis, high-temperature single-crystal X-ray diffraction). The structures of PdBi2 polymorphic modifications were refined at temperatures of 300, 373, 473, 573 and 637 K based on the high-temperature single-crystal X-ray diffraction data. A low-temperature modification of α-PdBi2 is monoclinic, space group C2/m (a = 12.726(1)A, b = 4.2605(4)A, c = 5.5668(5)A, β = 102.51(1) °, V = 299.95(5)A3, Z = 2). It is stable in the temperature range from 300K (27 °C) to 573K (300 °С) and is corresponding to the mineral froodite. A high-temperature modification of β-PdBi2 was fixed at the temperature 673K (400 °C). The phase β-PdBi2 is structural analogue of the mineral urvancevite: it’s tetragonal, space group I4/mmm (a = 3.3876(3) A, c = 13.092(2) A, V = 150.24(4) A3, Z = 1). The phase transition refers to a type I and is a reconstructive polymorphic transformation with a rearrangement of the first coordination sphere.
About the Authors
O. V. Karimova
Institute of Geology of Ore Deposits RAS
Russian Federation
Russian Federation
Oksana V. Karimova
Moscow
N. N. Eremin
Institute of Geology of Ore Deposits RAS; Lomonosov Moscow State University
Russian Federation
Russian Federation
Nikolay N. Eremin
Moscow
A. A. Mezhueva
Institute of Geology of Ore Deposits RAS
Russian Federation
Russian Federation
Anna A. Mezhueva
Moscow
N. S. Uporova
Zavaritzkiy Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
Natalia S. Uporova
Ekaterinburg
A. A. Zolotarev
Saint-Petersburg State University
Russian Federation
Russian Federation
Andrey A. Zolotarev
Saint-Petersbur
D. A. Chareev
Institute of Experimental Mineralogy RAS
Russian Federation
Russian Federation
Dmitriy A. Chareev
Chernogolovka
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Review
For citations:
Karimova O.V., Eremin N.N., Mezhueva A.A., Uporova N.S., Zolotarev A.A., Chareev D.A. Structural transformations and phase transition froodite (α–PdBi2) — urvantsevite (β–PdBi2) at high temperature. Moscow University Bulletin. Series 4. Geology. 2025;64(1):3-9. (In Russ.) https://doi.org/10.55959/MSU0579-9406-4-2025-64-1-3-9
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