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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Ferroelectric crystal Ca9Yb(VO4)7 in the series of Ca9R(VO4)7 non-linear optical materials (R = REE, Bi, Y)статья
Статья опубликована в высокорейтинговом журнале
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: 8 сентября 2017 г.
- Авторы: Lazoryak Bogdan I., Aksenov Sergey M., Stefanovich Sergey Yu, Dorbakov Nikolai G., Belov Dmitriy A., Baryshnikova Oksana V., Morozov Vladimir A., Manylov Mikhail S., Zhoubin Lin
- Журнал: Journal of Materials Chemistry С
- Том: 5
- Номер: 9
- Год издания: 2017
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 2301
- Последняя страница: 2310
- DOI: 10.1039/c7tc00124j
- Аннотация: The crystal structure, thermal, dielectric and second harmonic generation (SHG), and nonlinear optical activity data for whitlockite-type Ca9Yb(VO4)7 single crystals were obtained on one and the same sample produced by means of the Czochralski method. The crystal structure refinement has revealed that Yb3+ cations substitute for Ca2+ ions only in the M1, M2 and M5 positions of the whitlockite-type structure. Dielectric, differential thermal analysis and SHG data have shown that Ca9Yb(VO4)7 belongs to the family of high-temperature Ca3(VO4)2 ferroelectrics with Curie temperature Tc = 1221 K, where the symmetry changes from R3c to R%3c. At higher temperatures a previously unknown complementary phase transition is discovered at T2 = 1276 K and is associated with the symmetry change during heating from R%3c to R%3m. Unlike other whitlockites, two phase transitions in Ca9Yb(VO4)7 are separated by a broad interval (DT = 55 K) which allows one to register two phase transitions by DSC and dielectric measurements. According to the thermal type both transitions are classified as first-order transformations and their structural mechanisms are considered. Inhomogeneity in the cation distribution is argued to have a crucial influence on the optical quality and ferroelectric domain structures of Ca9Yb(VO4)7 and other whitlockite-type laser crystals.
- Добавил в систему: Лазоряк Богдан Иосипович
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