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Oxygen ion conductivity of (Yb0.9-x Tb (x) Ca-0.1)(2)Ti2O7-delta solid solutionsстатья
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: Shlyakhtina A.V., Belov D.A., Stefanovich S.Yu, Karyagina O.K., Shcherbakova L.G.
- Журнал: Inorganic Materials
- Том: 48
- Номер: 11
- Год издания: 2012
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 1126
- Последняя страница: 1130
- DOI: 10.1134/S0020168512100111
- Аннотация: We have studied terbium substitution for ytterbium in (Yb0.9 - x Tb (x) Ca-0.1)(2)Ti2O7 - delta (x = 0.1, 0.2, 0.3, 0.4) pyrochlore solid solutions synthesized through coprecipitation followed by firing at 1550A degrees C. The results indicate that only a small amount of terbium (less than 10%) can be incorporated into the pyrochlore structure of (Yb0.9Ca0.1)(2)Ti2O6.9 because of the large difference in ionic radius between the terbium and ytterbium cations: Delta r = r(Tb (CN 8) (3+) ) - r(Yb (CN 8) (3+) ) = 0.055 . The oxygen ion conductivity of the (Yb0.9 - x Tb (x) Ca-0.1)(2)Ti2O7 - delta solid solutions has been determined by impedance spectroscopy in air in the temperature range 300 to 900A degrees C. At high temperatures (t > 640A degrees C), their bulk conductivity was essentially independent of the Yb/Tb ratio. The observed decrease in density and microstructural changes were insignificant. At relatively low temperatures (t < 640A degrees C), the bulk conductivity decreased slightly, and the decrease depended little on terbium concentration.
- Добавил в систему: Стефанович Сергей Юрьевич