Pyroelectric and electrocaloric effect of ⟨1 1 1⟩-oriented 0.9PMN-0.1PT single crystal

In this paper, the polarization vs. electric field hysteresis loops of (1 1 1)-oriented 0.9PbMg(1/3)Nb(2/3)O(3)-0.1PbTiO(3) (0.9PMN-0.1PT) single crystal at different temperatures (20-110 degrees C) were measured. The adiabatic temperature change Delta T of < 1 1 1 > -oriented 0.9PMN-0.1PT single crystal due to the application or withdraw of electric field were calculated through the thermodynamic relation. The largest temperature change Delta T achieves similar to 1 K with only a change of 40 kV/cm electric field, the mechanism of the electrocaloric effect (ECE) is discussed for 0.9PMN-0.1PT crystal. The pyroelectric coefficient of 0.9PMN-0.1PT under bias field was calculated according to the data of hysteresis loop. The result shows that 0.9PMN-0.1PT have large pyroelectric coefficient under bias field, the largest (partial derivative P/partial derivative T)(E) value achieves -0.5 mu C/cm(2) K. (C) 2011 Elsevier B. V. All rights reserved.