Abstract
The electrocaloric effect (EC) of PMN-PNN-PZT films is discussed. 500nm-thick PMN-PNN-PZT thin films are fabricated by a state-of-the-art chemical solution deposition from a precursor solution (Inostek Inc.) with PMN-PNN/PZT = 30/70. The polarization hysteresis loop is slim and nonlinear, and compared with PZT, the hysteretic behavior is smaller. The electrocaloric temperature change deltaT due to applied deltaE is calculated. PMN-PNN-PZT films exhibit deltaT of 3.8K at 250C under the field of 500kV/cm. The possibilities of pyroelectric energy harvesting using these PZT films are investigated.
