Abstract
The dielectric and pyroelectric responses of MgO-modified Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ceramics were investigated near FR(LT)–FR(HT) phase transition. It was found that MgO additive reduced the FR(LT)–FR(HT) phase transition temperature from 41°C to room temperature (24°C). Superior room-temperature pyroelectric properties were obtained in the composition of 0.10wt% MgO addition without DC bias. The largest pyroelectric coefficient, 65×10−8Ccm−2K−1, was detected. Accordingly, the detectivity figures of merit Fd had maximum values of 20×10−5Pa−1/2, and especially the voltage responsivity Fv=0.91m2C−1 is the highest value reported so far among all pyroelectric materials. It shows promising potential for application in uncooled pyroelectric infrared detector.
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