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Title: | Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model |
Authors: | Rushchanskii, K. Z. Bilanych, R. M. Molnar, Alexander Yevych, R. M. Kohutych, Anton Perechinskii, S. I. Samulionis, V. Banys, J. Vysochanskii, Yulian |
Keywords: | Blume–Emery–Griffiths model, ferroelectrics, phase diagrams, tricritical point |
Issue Date: | Feb-2016 |
Publisher: | Wiley-VCH |
Citation: | Ferroelectricity in (PbySn1−y)2P2S6 mixed crystals and random field BEG model / K. Z. Rushchanskii, R. M. Bilanych, A. A. Molnar, R. M. Yevych, A. A. Kohutych, S. I. Perechinskii, V. Samulionis, J. Banys, and Y. M. Vysochanskii // Physica Status Solidi B253, - 2016. - No.2, - pp.384–391/ DOI 10.1002/pssb.201552138 |
Abstract: | In Sn2P2S6 ferroelectric under compression, the second-order phase transition line is observed down to the tricritical point as the transition temperature decreases to 250 K. A tricriticality at a similar temperature is also revealed in the mixed crystals on S→Se substitution. For the mixed crystals with Sn→Pb substitution, ultrasound, hypersound, and low-frequency dielectric studies also show heterophase features appearing on decrease of the ferroelectric transition temperature below a so-called “waterline temperature” near 250 K. Such behavior agrees with the Blume–Emery–Griffiths (BEG) model appropriate for the ferroelectric system under investigation with a three-well local potential for the order parameter fluctuations. The BEG model modified by the random-field phase diagram in the vicinity of the tricritical point qualitatively explains the influence of the cationic substitution on the (PbySn1−y)2P2S6 ferroelectric properties. |
Description: | In Sn2P2S6 ferroelectric under compression, the second-order phase transition line is observed down to the tricritical point as the transition temperature decreases to 250 K. A tricriticality at a similar temperature is also revealed in the mixed crystals on S→Se substitution. For the mixed crystals with Sn→Pb substitution, ultrasound, hypersound, and low-frequency dielectric studies also show heterophase features appearing on decrease of the ferroelectric transition temperature below a so-called “waterline temperature” near 250 K. Such behavior agrees with the Blume–Emery–Griffiths (BEG) model appropriate for the ferroelectric system under investigation with a three-well local potential for the order parameter fluctuations. The BEG model modified by the random-field phase diagram in the vicinity of the tricritical point qualitatively explains the influence of the cationic substitution on the (PbySn1−y)2P2S6 ferroelectric properties. |
Type: | Text |
Publication type: | Стаття |
URI: | https://dspace.uzhnu.edu.ua/jspui/handle/lib/60468 |
Appears in Collections: | Наукові публікації кафедри фізики напівпровідників |
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2016_pssb_201552138p.pdf | article | 2.2 MB | Adobe PDF | View/Open |
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