Инд. авторы:	Melnikova S.V., Isaenko L.I., Goloshumova A.A, Lobanov S.I.
Заглавие:	Investigation of the ferroelastic phase transition in the SrMgF4 pyroelectric crystal
Библ. ссылка:	Melnikova S.V., Isaenko L.I., Goloshumova A.A, Lobanov S.I. Investigation of the ferroelastic phase transition in the SrMgF4 pyroelectric crystal // Physics of The Solid State. - 2014. - Vol.56. - Iss. 4. - P.757-760. - ISSN 1063-7834. - EISSN 1090-6460.
Внешние системы:	DOI: 10.1134/S1063783414040192; SCOPUS: 2-s2.0-84898951805; WoS: 000334681700018;
Реферат:	eng: A SrMgF4 compound has been synthesized and a high optical-quality crystal has been grown. Optical-polarization observations, X-ray diffraction analysis, and the measurement of the birefringence Δni (t) in the SrMgF4 crystal have been carried out in the temperature range of 90-1200 K. A second-order improper ferroelastic phase transition accompanied by birefringence anomalies and the symmetry change P1121 (Z = 12) ↔ Cmc21 (Z = 4) has been discovered at T 0 = 478 ± 1 K. The crystal remains pyroelectric in both phases. Considerable contributions of the fluctuations of the order parameter have been observed in the temperature ranges of (T 0 - T) < 15 K and (T - T 0) < 60 K. © 2014 Pleiades Publishing, Ltd.
Ключевые слова:	BAMNF4;
Издано:	2014
Физ. характеристика:	с.757-760