Рубрики:
BaMnF4
BaMnF4
Аннотация: 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 Delta n (i) (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 P112(1) (Z = 12) a dagger" Cmc2(1) (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.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia
Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Isaenko, L. I.; Goloshumova, A. A.; Lobanov, S. I.; Council on Grants from the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]; Siberian Branch of the Russian Academy of Sciences within the Interdisciplinary Integration Project of Basic Research [28]