Abstract
In the present study, 0.10Pb(Sb1/2Sn1/2)O3-0.25PbTiO3-0.65PbZrO3 ceramics modified with La2O3 (1 mol%) and MnO2 (0∼0.30 mol%) were fabricated, and the structural and pyroelectric properties with different amounts of MnO2 were studied. The crystal structure of specimens was rhombohedral, and average grain sizes decreased with increasing amounts of MnO2. The (Pb0.99La0.01)[(Sb1/2Sn1/2)0.10Ti0.25Zr0.65]O3 specimen modified with 0.24 mol% MnO2 showed a large pyroelectric coefficient, p, (=6.73×10-8 C/cm2 K) and voltage responsivity, Rv, (=125 V/W). Also, in the same specimens, noise equivalent power, NEP, and detectivity, D*, were 2.376×10-7 W/Hz1/2 and 6.793×106 cm Hz1/2 W, respectively. In the (Pb0.99La0.01)[(Sb1/2Sn1/2)0.10Ti0.25Zr0.65]O3 specimens modified with 0.24 mol% MnO2 voltage responsivity decreased with increasing chopper frequency, and was independent of the thickness of the specimens.
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