DIELECTRIC AND PYROELECTRIC PROPERTIES OF PB(MG1 3NB2/3)O-3-PB(MG1/3TA2/3)O-3-PBTIO3 CERAMICS MODIFIED WITH MNO2/

In the present study, 0.4Pb(Mg1/3Nb2/3)O-3 - 0.3Pb(Mg1/3Ta2/3)O-3 - 0. 3PbTiO(3) ceramics modified with MnO2(0.05 similar to 1 wt%) were fabr icated, and the influence of MnO2 addition on the microstructure, diel ectric and pyroelectric properties of the ceramics are investigated by changing additive amounts and sintering temperature. The stability of perovskite was studied as a function of sintering temperature. The di electric and pyroelectric coefficient decreased considerably with the addition of 0.05 to 0.1wt%MnO2. The dissipation factor was lowered by adding small amounts of MnO2, with 0.3 wt%MnO2 giving the lowest dissi pation factor. The MnO2 addition improved the pyroelectric figure of m erit.