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Composition-induced phase transition in Ca14Zn6-xGa10+xO35+x/2 (x=0.0 and 0.5)статья
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: Istomin S.Ya, Chernov S.V., Antipov E.V., Dobrovolsky Yu A.
- Журнал: Journal of Solid State Chemistry
- Том: 180
- Номер: 6
- Год издания: 2007
- Издательство: Elsevier B.V.
- Местоположение издательства: Netherlands
- Первая страница: 1882
- Последняя страница: 1888
- DOI: 10.1016/j.jssc.2007.04.013
- Аннотация: Novel complex oxides Ca14Zn6Ga10O35 and Ca14Zn5.5Ga10.5O35.25 were prepared in air at 1200 degrees C, 72 h. Refinements of their crystal structures using X-ray powder diffraction data showed that Ca14Zn6Ga10O35 is ordered (S.G. F23, R-f(2) = 0.0458, R-P = 0.0485, R-wp = 0.0659, Z(2) = 1.88) and Ca14Zn5.5Ga10.5O35.25 disordered (S.G. F432, R-F(2) = 0.0346, R-p = 0.0601 R-wp = 0.0794, x(2) = 2.82) variants of the crystal structure of Ca14Zn6Al10O35. In the crystal structure of Ca14Zn6Ga10O35, there are large empty voids, which could be partially occupied by additional oxygen atoms upon substitution of Zn2+ by Ga3+ as in Ca14Zn5.5Ga10.5O35.25. These oxygen atoms are introduced into the crystal structure of Ca14Zn5.5Ga10.5O35.25 only as a part of four tetrahedra (Zn, Ga)O-4 groups sharing common vertex. This creates a situation where even a minor change in the chemical composition leads to considerable anion and cation disordering resulting in a change of space group from F23 (no. 196) to F432 (no. 209). (c) 2007 Elsevier Inc. All rights reserved.
- Добавил в систему: Антипов Евгений Викторович