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Investigation of the ferroelastic phase transition in the SrMgF4 pyroelectric crystal / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 4. - P. 757-760, DOI 10.1134/S1063783414040192. - Cited References: 8. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (project no. NSh-4828.2012.2) and the Siberian Branch of the Russian Academy of Sciences within the Interdisciplinary Integration Project of Basic Research no. 28. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
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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Публикация на русском языке Исследование сегнетоэластического фазового перехода в пироэлектрике SrMgF4 [Текст] / С. В. Мельникова [и др.] // Физ. тверд. тела. - 2014. - Т. 56 Вып. 4. - С. 727-730

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]
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Phase transitions in polar crystal RbLiCrO4 / S. V. Melnikova [и др.] // Ferroelectrics. - 1993. - Vol. 143, Is. 1. - P. 73-78, DOI 10.1080/00150199308008314 . - ISSN 0015-0193
Кл.слова (ненормированные):
crystal structure -- phase transition -- pyroelectric -- birefringence
Аннотация: At room temperature rubidium lithium chromate belongs to the sp. gr. P31c with unit cell parameters a = b − 5.396, c = 9.171 Å, γ = 120[ddot]. The X-ray and optical measurements have shown symmetry changes on successive phase transitions at 843 K, 606 K, and 550 K. Unusual time dependence of an X-ray reflections intensity have been found above 653 K, an explanation of this effect is suggested.
, crystal structure, pyroelectric, birefringence

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Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Grankina, V. A.; Voronov, V. N.; Воронов, Владимир Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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Magnetoimpedance and magnetocapacitance of anion-substituted manganese chalcogenides / S. S. Aplesnin [et al.] // J. Appl. Phys. - 2017. - Vol. 121, Is. 7. - Ст. 075701, DOI 10.1063/1.4976097. - Cited References: 26. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 17-42-240079 r_sibir_a. This study was supported by the Russian Foundation for Basic Research project No. 16-52-00045 Bel_a and government work No. 114090470016. . - ISSN 0021-8979
Кл.слова (ненормированные):
Activation energy -- Chalcogenides -- Inorganic compounds -- Manganese -- Neel temperature -- Carrier relaxation time -- Impedance spectroscopy -- Low and high frequencies -- Magnetically ordered state -- Magneto-resistive effect -- Magnetocapacitance -- Pyroelectric current -- Temperature dependence -- Temperature distribution
Аннотация: The magnetoresistive effect in MnSe1−XTeX manganese chalcogenides with a substitute concentration of X = 0.1 is studied by impedance spectroscopy. The magnetoimpedance above the Neel temperature is found. The obtained experimental data are explained in the framework of the model of existence of magnetic nanoareas of two types. Two activation energies in the low- and high-frequency regions are determined from the frequency and temperature dependences of the permittivity described in the Debye model. The extrema found in the temperature dependence of the pyroelectric current are consistent with the maxima in the temperature dependence of magnetization. Temperature dependence of the carrier relaxation time is established. The magnetocapacitance of the MnSe1−XTeX solid solutions is found. The change in the carrier type above the Neel temperature and the temperature of the transition to the magnetically ordered state in the MnTe nanoarea is established.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, M. F. Reshetnev Corporation, Krasnoyarsk, Russian Federation
Scientific-Practical Materials Research Center NAS, Minsk, Belarus

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Korolev, V. V.; Sitnikov, M. N.; Yanushkevich, K. I.
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