Microstructure, ferroelectric and electrocaloric effect of (Pb_0.88La_0.08)(Zr_0.65Ti_0.35)O₃ ceramics doped with ZnO

ABSTRACT

In this study, in order to develop relaxor ferroelectric ceramics with large electrocaloric effect, (Pb_0.88La_0.08)(Zr_0.65Ti_0.35)O₃ ceramics were manufactured using conventional solid-state reaction method with the amount of ZnO addition. The XRD pattern of all specimens indicated general perovskite structure with secondary phase. With increasing the amount of ZnO addition, the coexistence of rhombohedral and tetragonal phases was observed. The temperature change ΔT of specimen exhibited the tendency to increase with the amount of ZnO addition. Furthermore, at the 0.6 wt% added ZnO ceramics, the optimal value of ΔT = 0.345°C in ambient temperature of 215°C was appeared. It is considered that (Pb_0.88La_0.08)(Zr_0.65Ti_0.35)O₃ ceramics show the possibility of refrigeration device application.

KEYWORDS:

• (Pb_0.88La_0.08)(Zr_0.65Ti_0.35)O₃ ceramics
• electrocaloric effect
• temperature changes
• electric field