Crystal Structure of Synthetic High-Chromium Analogue of Yimengite

Butvina, V.G.; Kuzmin, A.V.; Spivak, A.V.; Safonov, O.G.; Lazarenko, V.A.; Dorovatovskii, P.V.

Авторы: Butvina V.G., Kuzmin A.V., Spivak A.V., Safonov O.G., Lazarenko V.A., Dorovatovskii P.V.
Журнал: Crystallography Reports
Том: 67
Номер: 7
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 1114
Последняя страница: 1121
DOI: 10.1134/S1063774522070422
Аннотация: Abstract—The structure of K0.90Ti5.16Cr2.94Fe2.54Mg0.87Al0.22Mn0.30O19 has been investigated by single-crystal X-ray diffraction (using synchrotron radiation of the KSRS-Kurchatov source) and Raman spectroscopy. The studied crystal was extracted from the products of an experiment performed in the chromite–ilmenite–K2CO3–H2O–CO2 system at 5 GPa and 1200°С. The crystal has a hexagonal cell with the following parameters: a = 5.8920(2) Å, c = 23.0113(8) Å, sp. gr. P63/mmc, Z = 4 The compound is isostructural to yimengite (potassium mineral of the magnetoplumbite group). In contrast to yimengite, Fe3+ is absent in the compound under consideration. The cation Fe2+ is distributed between tetrahedral М and octahedral М sites. The absence of Fe3+3 compound under study conditioned incorporation of Cr and small amount of Al into the M1 (octahedron) and M2 (trigonal bipyramid) sites. In contrast to yimengite, chromium in the synthetic potassium phase is distributed over three sites: M1, M2, and M5. The data obtained can be used to specify the nomenclature of magnetoplumbite-group compounds.
Добавил в систему: Бутвина Валентина Григорьевна

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Crystal Structure of Synthetic High-Chromium Analogue of Yimengiteстатья

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