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Acoustic attenuation in ferroelectric Sn2P2S6 crystals

100%
Kohutych A., Yevych R., Perechinskii S., Vysochanskii Y.
Open Physics
|
2010
|
vol. 8
|
issue 6
905-914
EN
The temperature and frequency dependencies of sound attenuation for the proper uniaxial ferroelectric Sn2P2S6, which has a strong nonlinear interaction of the polar soft optic and fully symmetrical optic modes that is related to the triple well potential, were studied by Brillouin spectroscopy. It was found that the sound velocity anomaly is described in the Landau-Khalatnikov approximation with one relaxation time. For explanation of the observed temperature and frequency dependencies of the sound attenuation in the ferroelectrric phase, the accounting of several relaxation times is needed and, for quantitative calculations, the mode Gruneisen coefficients are more appropriate as interacting parameters than are the electrostrictive coefficients. Relaxational sound attenuation by domain walls also appears in the ferroelectric phase of Sn2P2S6 crystals.
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Elastic properties of (PbySn1−y )2P2S6 solid solutions

76%
Bilanych R., Yevych R., Kohutych A., Perechinskii S., Stoika I., Vysochanskii Y.
Open Physics
|
2014
|
vol. 12
|
issue 9
611-614
EN
Elastic properties of (PbySn1−y )2P2S6 solid solutions were studied using Brillouin scattering technique. Different scattering geometries were used for sound velocities determination that make it possible to find all components of the stiffness tensor. The concentration dependencies of volume compressibility, the Grüneisen parameter and Debye temperature were investigated. The results obtained were used to analyze chemical bonding with substitution of tin by lead at room temperature in the crystals under consideration.
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