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Specific features of the structural transformations in La1-x Ca (x) Mn-0.98 (Fe0.02O3+delta)-Fe-57 (x=0.05-0.50)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: Sedykh V.D., Rusakov V.S., Zver'kova I.I., Dubovitskii A.V., Kulakov V.I.
- Журнал: Physics of the Solid State
- Том: 53
- Номер: 7
- Год издания: 2011
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 1440
- Последняя страница: 1447
- DOI: 10.1134/S1063783411070237
- Аннотация: The specific features of the structural transformations in La1 - x Ca (x) Mn-0.98 (Fe0.02O3 + delta)-Fe-57 (x = 0.05-0.50) at different Ca concentrations have been studied using Mossbauer spectroscopy and X-ray diffraction. Variations of the heat treatment conditions (annealing in vacuum and in air) cause reversible phase transitions. For calcium concentrations to 20%, a whole set of phases with reversible structural transitions, such as PnmaII II <-> PnmaI <-> R3c, can be obtained using the corresponding heat treatment. The phases are successively suppressed with increasing calcium concentration. The rhombohedral phase is suppressed for x = 0.20. When the Ca concentration exceeds 20%, the PnmaII phase is suppressed; as a result, the PnmaI phase with equal concentrations of Mn4+ and calcium stable during any heat treatments remains. The specific features of phase formation in the La1 - x Ca (x) Mn-0.98 (Fe0.02O3 + delta)-Fe-57 compound doped with calcium and in the basis LaMnO3 + delta compound have been compared.
- Добавил в систему: Русаков Вячеслав Серафимович