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Ferroelectrics Volume 419, 2011 - Issue 1
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Original Articles

Piezoelectric and Ultrasonic Studies of New Lamellar Crystals of CuInP2S6 Type

V. Samulionis Physics Faculty of Vilnius University, Sauletekio al. 9/3, 10222, Vilnius, Lithuania
,
J. Banys Physics Faculty of Vilnius University, Sauletekio al. 9/3, 10222, Vilnius, Lithuania
,
A. Dziaugys Physics Faculty of Vilnius University, Sauletekio al. 9/3, 10222, Vilnius, Lithuania
,
M. I. Gurzan Institute of Solid State Physics and Chemistry of Uzhgorod University, Uzhgorod, Ukraine
,
I. P. Pritz Institute of Solid State Physics and Chemistry of Uzhgorod University, Uzhgorod, Ukraine
&
YU. Vysochanskii Institute of Solid State Physics and Chemistry of Uzhgorod University, Uzhgorod, Ukraine
Pages 97-102 | Received 12 Aug 2010, Published online: 25 Oct 2011
 
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Abstract

The ultrasonic and piezoelectric investigations were performed in CuInP2S6 family layered crystals, where Cu, In, S were substituted by Ag, Bi and Se. We have shown that in CuBiP2Se6 crystals the anomalies of piezoelectric sensitivity and ultrasonic velocity appears in the vicinity of two phase transitions at 145 K and 220 K. In AgBiP2S6 layered crystals the only one anomaly of ultrasonic velocity and attenuation was observed at 220 K. In these crystals below room temperature the large ultrasonic attenuation and corresponding velocity dispersion were observed. Such ultrasonic behaviour was supposed to be determined by acoustoionic interaction due to large ionic conductivity of Ag+ cations.

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