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Incorporation of Ti into the crystal structures of the high‑pressure dense silicates anhydrous phase B and superhydrous phase Bстатья
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: 24 января 2020 г.
- Авторы: Matrosova E.A., Welch M.D., Bobrov A.V., Bindi L., Pushcharovsky D.Yu, Irifune T.
- Журнал: Physics and Chemistry of Minerals
- Том: 46
- Год издания: 2019
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 909
- Последняя страница: 920
- DOI: 10.1007/s00269-019-01050-0
- Аннотация: The crystal structure and chemical composition of crystals of Ti-bearing anhydrous phase B and superhydrous phase B synthesized at 12 – 21 GPa and 1600°C have been investigated. The compounds was found to be orthorhombic. Titanium was found as substitute for Si at the Si1O6 octahedron in both structures, with mean distance Si1–O=1.825 Å (site composition is Si0.84Ti4+0.16) and Si1–O=1.842 (site composition is Si0.92Ti0.08) for AnhB and SuB, respectively. Such substitutions leads to a 4% expansion of the Si1O6 octahedron with respect to the values typically observed for pure AnhB and Fe2+-bearing AnhB and pure SuB. The successful synthesis of Ti-bearing superhydrous phase B indicate that this phase can be stable at temperatures typical of the mantle transition zone and the lower mantle. Thus, water can be transported by Ti-bearing superhydrous B to the lower mantle even at temperatures of the normal mantle geotherm.
- Добавил в систему: Пущаровский Дмитрий Юрьевич