Abstract
In this paper, the polarization vs. electric field hysteresis loops of 〈1 1 1〉-oriented 0.9PbMg 1/3Nb 2/3O 3–0.1PbTiO 3 (0.9PMN–0.1PT) single crystal at different temperatures (20–110 °C) were measured. The adiabatic temperature change Δ 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 Δ T achieves ∼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 (∂ P/∂ T) E value achieves −0.5 μC/cm 2 K.
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