Orientational dependence of ultrasonic velocity near the phase transition in Sn2P2S6 single crystals
- 1 March 1988
- journal article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 79 (1) , 225-228
- https://doi.org/10.1080/00150198808229437
Abstract
The results of ultrasonic velocity and attenuation measurements in Sn2P2S6 semiconductor crystals near the ferroelectric phase transition are presented for X, Y, Z crystalografic directions. It is shown that in ferroelectric phase for Y and Z directions the temperature dependencies can be well described by Landau theory and dispersion does not occur in the frequency range 10 MHz — 17 GHz. The strong frequency dispersion of ultrasonic velocity have been observed only in the direction of ferroelectric X axis.Keywords
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