Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10640096 | Materials Science and Engineering: B | 2005 | 4 Pages |
Abstract
The pyroelectric properties of ã1 1 1ã-oriented (1 â x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (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 Ã 10â4 C/m2 K. However, the best pyroelectric performance can be achieved for PMN-0.26PT crystal, with the voltage responsivity and detectivity figures of merit Fv and Fd of about 0.11 m2/C and 15.3 Ã 10â5 Paâ1/2, respectively, over a wide range of frequency from 50 to 30 kHz. The results demonstrate that superior pyroelectric performance makes ã1 1 1ã-oriented PMN-xPT crystals a promising candidate for room-temperature infrared detectors and thermal imagers.
Related Topics
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Authors
Yanxue Tang, Xiangyong Zhao, Xinming Wan, Xiqi Feng, Weiqing Jin, Haosu Luo,