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Ti/Zr isomorphism in wadeite: the crystal structure of the titanium-dominant K2(Ti0.55Zr0.45)Si3O9 member of the seriesстатья
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: 12 июля 2017 г.
- Авторы: Karimova O.V., Yakubovich O.V., Ageeva O.A., Erofeeva K.G.
- Журнал: Crystallography Reports
- Том: 62
- Номер: 3
- Год издания: 2017
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 391
- Последняя страница: 396
- DOI: 10.1134/S1063774517030117
- Аннотация: The crystal structure of the titanium-rich mineral wadeite K2(Ti0.55Zr0.45)Si3O9 from rischorrites of the Khibiny Alkaline Massif (Kola Peninsula, Russia) is studied by X-ray diffraction (XCalibur-S diffractometer, R = 0.0459): a = 6.8611(6) and c = 10.0611(9) Å; space group P63/m, Z = 6; Dx = 3.03 g/cm3. It is shown that the unit-cell parameters and volume of the mineral of mixed (Ti/Zr) composition are naturally intermediate between those of the terminal members of the isomorphous wadeite-based K2ZrSi3O9–K2(Ti0.55Zr0.45)Si3O9–K2TiSi3O9 series. The expected correlation is due to the ionic radii of Zr4+ and Ti4+ which determine the lengths of Zr/Ti–O bonds in octahedra. The data of field observations and microscopic studies show that the Ti-dominant wadeite is formed on the basis of primary zirconium mineral in the course of a late imposed process under unique geochemical conditions.
- Добавил в систему: Якубович Ольга Всеволодовна