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Alkaline-earth metal-doped perovskites La0.95A0.05MnO3+δ (A = Ca, Sr): New structural and magnetic features revealed by 57Fe Mössbauer spectroscopy and magnetic measurementsстатья
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 ноября 2021 г.
- Авторы: Pchelina Diana, Sedykh Vera, Chistyakova Nataliya, Rusakov Vyacheslav, Alekhina Yulia, Tselebrovskiy Alexey, Fraisse Bernard, Stievano Lorenzo, Sougrati Moulay Tahar
- Журнал: Journal of Physics and Chemistry of Solids
- Том: 159
- Год издания: 2021
- Издательство: Pergamon Press Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 110268
- Номер статьи: 110268
- DOI: 10.1016/j.jpcs.2021.110268
- Аннотация: Ca- and Sr-doped lanthanum manganese perovskites La0.95A0.05Mn0.98Fe0.02O3+δ (A = Ca, Sr) (LCM and LSM) of non-stoichiometric (NS) and stoichiometric (S) compositions were prepared by sol-gel method and investigated by 57Fe Mossbauer spectroscopy and magnetic measurements. In contrast to non-stoichiometric samples, which contain pure singles phases, a mixture of orthorhombic phases O (PnmaI), O′ (PnmaII)and O′′ (PnmaII*)are detected in samples of stoichiometric compositions. The magnetic data, supported by Mo ̈ssbauer measurements, show the spontaneous formation of magnetically ordered clusters with sizes in the range 2.5–4.6 nm in all samples. The main differences between the investigated LCM and LSM systems, and in particular the less extended phase separation in LSM-S than in LCM-S is connected to the difference in ionic radii on the doping ions, the influence of the Jahn-Teller effect at the Mn+3 centres and the size distributions of the ferromagnetic clusters. Our results show, for the first time, that the O′′ (PnmaII*) phase is characterized by antiferromagnetic ordering.
- Добавил в систему: Комлева Диана Игоревна
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