Dependence of Poling Field on Pyroelectric Property of Pb0.9La0.1TiO₃ Ceramics

Abstract

The pyroelectric property of Pb0.9La0.1TiO₃ ceramics in a range of 1.3-4.1 ㎛, fabricated by conventional solid sintering, was investigated as a function of poling field. The pyroelectric coefficient of the 4.1 ㎛ of Pb0.9La0.1TiO₃ ceramics is higher than that of the 1.3 ㎛ and 1.7 ㎛ of Pb0.9La0.1TiO₃ ceramics at a low poling field and the pyroelectric coefficient is 25 nC/㎠K at a 4 kV/mm poling field in every grain size. In order to explain this phenomenon, the intrinsic and extrinsic effects in view of the definition of the pyroelectric coefficient are introduced. The intrinsic and extrinsic effects on the pyroelectric property were investigated by measuring the tetragonal ratio and the I002 with temperature with high temperature X-ray diffractometer. The change of spontaneous polarization and the 90˚ domain wall motion with temperature in the 1.3 ㎛ and 4.2 ㎛ of Pb0.9La0.1TiO₃ ceramics have no effects on the pyroelectric coefficient. In our study, it can be seen that the pyroelectric coefficient is related to the quantity of 180˚ domain switching after poling treatment.