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XAFS studies of the local environment of Pb impurity atoms in barium, strontium, and calcium titanatesстатья
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: 15 октября 2015 г.
- Авторы: Lebedev A.I., Sluchinskaya I.A., Erko A., Veligzhanin A.A., Chernyshov A.A.
- Журнал: Physics of the Solid State
- Том: 51
- Номер: 5
- Год издания: 2009
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 991
- Последняя страница: 997
- DOI: 10.1134/S1063783409050175
- Аннотация: The local environment of Pb impurity atoms in BaTiO3, SrTiO3, and CaTiO3 crystals was studied by XAFS technique. It is shown that, in both polar and nonpolar phases of BaTiO3 and in SrTiO3, the Pb atoms are displaced from the A lattice sites by ∼0.15 Å; in CaTiO3 this displacement is absent. Large values of Debye-Waller factors (0.05–0.10 Å2) for the atoms in the first shell of Pb observed in all the three crystals indicate the distortion of the oxygen environment of Pb atoms. The appearance of these features was explained by the fact that the Pb-O chemical bond has a noticeable covalent component and a Pb atom can form strong bonds only with four of the 12 surrounding oxygen atoms. The obtained data were used to determine the main factors responsible for the occurrence of ferroelectric phase transition in SrTiO3 and CaTiO3 and for the increase of the Curie temperature of BaTiO3 when it is doped with Pb.
- Добавил в систему: Лебедев Александр Иванович