Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Structural transformations and phase transition froodite (α–PdBi2) — urvantsevite (β–PdBi2) at high temperature. / Karimova, Oxana V.; Eremin, N. N.; Mezhueva, A. A.; Uporova, N. S.; Zolotarev, A. A.; Chareev, D. A.
в: ВЕСТНИК МОСКОВСКОГО УНИВЕРСИТЕТА. СЕРИЯ 4: ГЕОЛОГИЯ, Том 64, № 1, 01.01.2025, стр. 3-9.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Structural transformations and phase transition froodite (α–PdBi2) — urvantsevite (β–PdBi2) at high temperature
AU - Karimova, Oxana V.
AU - Eremin, N. N.
AU - Mezhueva, A. A.
AU - Uporova, N. S.
AU - Zolotarev, A. A.
AU - Chareev, D. A.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - 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.
AB - 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.
UR - https://www.mendeley.com/catalogue/0e20eb3e-77f7-3181-9cfe-76744b4b93e9/
U2 - 10.55959/msu0579-9406-4-2025-64-1-3-9
DO - 10.55959/msu0579-9406-4-2025-64-1-3-9
M3 - Article
VL - 64
SP - 3
EP - 9
JO - Vestnik Moskovskogo Universiteta, Seriya 4: Geologiya
JF - Vestnik Moskovskogo Universiteta, Seriya 4: Geologiya
SN - 0579-9406
IS - 1
ER -
ID: 135531548