Please use this identifier to cite or link to this item:
https://dspace.uzhnu.edu.ua/jspui/handle/lib/61297
Title: | Dipole ordering and critical behavior of the static and dynamic properties in three-dimensional and layered MM′P2X6 crystals (M, M′–Sn, Cu, In; X–S, Se). |
Authors: | Vysochanskii, Yulian Molnar, Alexander Stephanovich, V. A. Cajipe, V. B. Bourdon, X. |
Keywords: | Phase transitions, ferroelectrics, dielectric properties, Raman scattering, lattice dynamics |
Issue Date: | 1999 |
Publisher: | Gordon and Breach Science |
Citation: | Dipole ordering and critical behavior of the static and dynamic properties in three-dimensional and layered MM′P2X6 crystals (M, M′–Sn, Cu, In; X–S, Se). / Yu. M. Vysochanskii, A. A. Molnar, V. A. Stephanovich, V. B. Cajipe, X. Bourdon. // Ferroelectrics. – 1999. – Vol. 226. – PP. 243–261. |
Abstract: | The thermodynamic properties and lattice dynamics of crystals MM‘P2X6 with cations in different valence states have been investigated. For Sn2P2S(Se)6 crystals with a threedimensional lattice, the interaction between polarization and deformation plays an important role in the mechanisms of the displacive transitions from a paraelectric to ferroelectric or incommensurate phase in the vicinity of a Lifshitz point on the state diagram. Layered CuInP2S6 crystals undergo a first order and order-disorder type phase transition to a ferrielectric phase. For these crystals, different polarization mechanisms within a wide frequency range were clearly observed and found to be interrelated via dielectric and Raman spectroscopy measurements. These mechanisms include the internal vibrations of (PzS,)~- anions; the external lattice modes in which In3+ and Cu+ ions participate; the relaxational critical slowingdown due to Cu+ ions which yield the order-disorder phase transition; and the low frequency relaxational dynamics which causes the “throw” of Cu+ ions into the interlayer space thus providing ionic conductivity. |
Description: | The thermodynamic properties and lattice dynamics of crystals MM‘P2X6 with cations in different valence states have been investigated. For Sn2P2S(Se)6 crystals with a threedimensional lattice, the interaction between polarization and deformation plays an important role in the mechanisms of the displacive transitions from a paraelectric to ferroelectric or incommensurate phase in the vicinity of a Lifshitz point on the state diagram. Layered CuInP2S6 crystals undergo a first order and order-disorder type phase transition to a ferrielectric phase. For these crystals, different polarization mechanisms within a wide frequency range were clearly observed and found to be interrelated via dielectric and Raman spectroscopy measurements. These mechanisms include the internal vibrations of (PzS,)~- anions; the external lattice modes in which In3+ and Cu+ ions participate; the relaxational critical slowingdown due to Cu+ ions which yield the order-disorder phase transition; and the low frequency relaxational dynamics which causes the “throw” of Cu+ ions into the interlayer space thus providing ionic conductivity. |
Type: | Text |
Publication type: | Стаття |
URI: | https://dspace.uzhnu.edu.ua/jspui/handle/lib/61297 |
Appears in Collections: | Наукові публікації кафедри фізики напівпровідників |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
1999_Ferroeleclrics_Vol.226_pp.243-261.pdf | article | 789.68 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.