In this study, in order to develop relaxor ferroelectric ceramics for refrigeration device application with large electrocaloric effect, PLZT(8/65/35) composition was fabricated using conventional solid-state method. The Curi temperature of this composition PLZT ceramics was 230℃, and the P-E hysteresis loops of the PLZT ceramics as a fuction of temperature became slim by degrees with higher temperatures. The maximum value of .T of 0.243°C in ambient temperature of 215°C with 30 kV/cm was appeared. It is considered that PLZT ceramics possess the possibility of refrigeration device application.

In this study, electrocaloric effects of Pb-free (Ba0.85Ca0.15)(Ti0.92Zr0.08)O3 ferroelectric ceramics were investigated and discussed using the characteristics of P-E hysteresis loops at wide temperature range from room temperature to 140℃. The remnant polarization Pr and coercive field Ec were decreased with increasing temperature. The temperature change ΔT by the electrcaloric effect was calculated by Maxwell`s relations, and reached the maximum of ∼0.15 at 120℃ under applied electric field of 30 kV/㎝.