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Study of a fluorite-like solid solution Na0.5-xBi0.5+xO2x-delta F2+2 delta-2x by x-ray powder diffraction and F-19 NMRстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Dombrovski E.N., Serov T.V., Ardashnikova E.I., Dolgikh V.A.
- Журнал: Russian Journal of Inorganic Chemistry
- Том: 48
- Номер: 5
- Год издания: 2003
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 734
- Последняя страница: 740
- Аннотация: The homogeneity range of a fluorite-like solid solution in the NaF-Bi2O3-BiF3 system has been studied by the isothermal annealing method at 600degreesC, X-ray powder diffraction, and F-19 NMR. The diagram of the dependence of the cubic unit cell parameter on the solid solution composition has been constructed. The diagram shows a mountain ridge. NMR shows that the experimental dependence of the number of introduced fluorine atoms along the line with a constant nonstoichiometry (delta = 0.4) in Na0.5 -xBi0.5 (+ x)(O,F)(2.40) is nonmonotone. The anion-excessive fluorite-like solid solution Na0.5 - xBi0.5 O-+ x(2x) F-- delta(2 + 2delta - 2x) has structural heterogeneities that influence changes in unit cell parameters and the number of introduced fluorine atoms with a change in the composition of a sample. These structural heterogeneities are manifested in the presence of two concentration regions of the homogeneity range and are presumably described by the existence of two major types of clusters-cuboctahedral and trianular-in the solid solution.
- Добавил в систему: Долгих Валерий Афанасьевич