Calcium fluorosilicate Ca5(SiO4)2F2 from burnt dumps of the Chelyabinsk coal basin (South Urals): crystal chemistry, spectroscopy, thermal behavior
- 作者: Brazhnikova A.S.1, Zolotarev A.A.1, Avdontсeva M.S.1, Krivovichev S.V.1,2, Krzhizhanovskaya M.G.1, Bocharov V.N.1, Vlasenko N.S.1, Rassomakhin M.A.3
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隶属关系:
- St. Petersburg State University
- Kola Science Center RAS
- South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
- 期: 卷 70, 编号 3 (2025)
- 页面: 363-371
- 栏目: КРИСТАЛЛОХИМИЯ
- URL: https://journal-vniispk.ru/0023-4761/article/view/293753
- DOI: https://doi.org/10.31857/S0023476125030026
- EDN: https://elibrary.ru/BEMFDN
- ID: 293753
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详细
The anthropogenic calcium fluorosilicate “kutyukhinite” Ca5(SiO4)2F2 from burnt dumps of the Chelyabinsk coal basin has been studied by single crystal and powder X-ray diffraction analyses in a wide temperature range. “Kutyukhinite” (P21/a, a = 11.4985(4), b = 5.0535(2), c = 8.7848(3) Å, β = 109.008(4)°, V = 482.63(3) Å3, R1 = 0.0183) is an anthropogenic analogue of kumtyubeite which belongs to the structural type of chondrodite. The empirical formula of “kutyukhinite” is Ca5.02(Si1.99O7.98)F2.04. Upon heating, its crystal structure expands anisotropically, with the direction of maximum thermal expansion close to the direction [100]. The relative change in bond lengths in silicon-oxygen tetrahedra with increasing temperature (27−927°C) is less than 0.6%, which is within the margin of error. At the same time, the relative increase in the average bond length of the
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作者简介
A. Brazhnikova
St. Petersburg State University
编辑信件的主要联系方式.
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
A. Zolotarev
St. Petersburg State University
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
M. Avdontсeva
St. Petersburg State University
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
S. Krivovichev
St. Petersburg State University; Kola Science Center RAS
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg; Apatity
M. Krzhizhanovskaya
St. Petersburg State University
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
V. Bocharov
St. Petersburg State University
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
N. Vlasenko
St. Petersburg State University
Email: st084249@student.spbu.ru
俄罗斯联邦, St. Petersburg
M. Rassomakhin
South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
Email: st084249@student.spbu.ru
俄罗斯联邦, Miass
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