Abstract
The pyroelectric properties of 〈1 1 1〉-oriented (1 − x)Pb(Mg 1/3Nb 2/3)O 3– xPbTiO 3 (PMN– xPT) crystals with x = 0.21, 0.26, 0.30 and 0.33 have been investigated. The pyroelectric coefficients were measured using a dynamic technique under various thermal and electrical conditions. The pyroelectric coefficients decrease with increasing PT content and dc bias, and nearly increase linearly with increasing temperature from 20 to 55 °C showing little thermal hysteresis. At room temperature, PMN–0.21PT crystal has the highest pyroelectric coefficient of 17.9 × 10 −4 C/m 2 K. However, the best pyroelectric performance can be achieved for PMN–0.26PT crystal, with the voltage responsivity and detectivity figures of merit F v and F d of about 0.11 m 2/C and 15.3 × 10 −5 Pa −1/2, respectively, over a wide range of frequency from 50 to 30 kHz. The results demonstrate that superior pyroelectric performance makes 〈1 1 1〉-oriented PMN– xPT crystals a promising candidate for room-temperature infrared detectors and thermal imagers.
Published Version
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