Abstract
ABSTRACTThe dielectric, pyroelectric and ferroelectric properties of (PbySn1−y)2P2S6 (y = 0.1, 0.2 and 0.3) single crystals were analysed in the vicinity of phase transition. The measurements were done covering a wide range of frequency (20 Hz to 1 MHz) and temperature (30350 K) range. Structural phase transition temperature decreases with increased lead concentration and evokes the broadening of the dielectric anomaly. The features of this phase transition are discussed and related to stereoactivity of Sn2+ ions and fluctuations of the concentration of Pb2+ ions. Pyroelectric measurements were performed from 190 K to 325 K during the heating cycle. These investigations showed that an increase of lead concentration does not affect the maximum value of pyroelectric coefficient, and the maximum values of pyroelectric coefficients γmax which (in the vicinity of the phase transition temperature) are nearly equal to 250 nC cm−2 K−1 for all the compositions. The temperature evolution of polarization hysteresis loops proved crystals being ferroelectrics.
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