Temperature Investigations of Hypersound Velocities in Sn2P2(SexS1 − x)6Ferroelectric Mixed Crystals

R. Yevych; С. И. Перечинский; A. A. Grabar; Yu. M. Vysochanskiǐ

doi:10.1080/00150190490423282

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Temperature Investigations of Hypersound Velocities in Sn₂P₂(Se_xS_{1 − x})₆Ferroelectric Mixed Crystals

R. Yevych С. И. Перечинский A. A. Grabar Yu. M. Vysochanskiǐ

Year: 2004 Journal: Ferroelectrics Vol: 298 (1)Pages: 97-101 Publisher: Taylor & Francis

DOI: 10.1080/00150190490423282

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Abstract

A temperature dependence of hypersound velocities at transition from a paraelectric phase to ferroelectric one near a Lifshitz point in Sn2P2(Se0.28S0.72)6 crystals was investigated by Brillouin scattering spectroscopy. Clear anomalies were observed in behavior of sound velocities and attenuation of waves propagating along Z axis of crystals. These anomalies are connected with instability of acoustic phonons that is an origin of the incommensurate phase appearance in mixed crystals with x > 0.28.

Keywords:

Ferroelectricity Materials science Brillouin Spectroscopy Condensed matter physics Brillouin scattering Phonon Brillouin zone Phase transition Dielectric Phase (matter) Scattering Optics Spectroscopy Physics Laser Optoelectronics

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Solid-state spectroscopy and crystallography

Physical Sciences → Materials Science → Materials Chemistry

Optical and Acousto-Optic Technologies

Physical Sciences → Physics and Astronomy → Atomic and Molecular Physics, and Optics

Nonlinear Optical Materials Research

Physical Sciences → Materials Science → Electronic, Optical and Magnetic Materials

Temperature Investigations of Hypersound Velocities in Sn₂P₂(Se_xS_{1 − x})₆Ferroelectric Mixed Crystals

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