Ultrasonic and piezoelectric studies of new layered ferroelectric compounds of Sn2P2S6 family

Piezoelectric and elastic properties of layered materials of Cu(In,Cr)P2(S,Se)6 system

“…The results of dielectric investigations of CuInP 2 Se 6 showed two phase transition: a second-order one at T i =248 K and a firstorder transition at T c =236 K [8]. There a hypothesis was put that an incommensurate phase occurs between T i and T c , because of the existence of anomalies of piezoelectric and elastic properties [9]. The nonpolar phase in CuInP 2 S 6 , CuInP 2 Se 6 and CuCrP 2 S 6 also was shown to be not of the usual paraelectric type, but, because of relatively strong dipole-dipole interactions, has polar clusters even at temperatures far above the transition [4].…”

Piezoelectric and Ultrasonic Studies of Mixed CuInP2(SXSe1 - X)6Layered Crystals

“…For piezoelectricity test we used direct measurement of electric signal arising on a thin plate working as ultrasonic transducer in usual pulse-echo ultrasonic experiment (see [7,9] for details). The lithium niobate transducer for excitation of longitudinal ultrasonic wave was attached to one end of quartz buffer and to another end of quartz buffer a thin ccut CuInP 2 (S x Se 1−x ) 6 plate was fixed.…”

“…The ultrasonic and piezoelectric measurements were carried out using the methods, which we previously developed for such measurements for pure CuInP 2 S 6 and CuInP 2 Se 6 crystals [8][9][10]. Ultrasonic velocity and attenuation measurements were carried out by automatic computer controlled pulse-echo ultrasonic system [11].…”

Ultrasonic and piezoelectric properties of the BT–LMT ceramic system

“…The piezoelectric measurements were performed using the custom-made automatic resonance-antiresonance system. [9][10][11][12] Calibration of the absolute sound velocity at required stabilized temperature was performed by precise measurement of the electromechanical antiresonance frequencies. Silicone oil was used to make acoustic bonds and silver paint electrodes were used in electric measurements.…”