A 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3-based Pyroelectric Generator and Temperature Sensor

We report the extremely-high pyroelectric power generation of a relaxar fenoelectric Pb-0.7(Mg1/3Nb2/3)O-3-0.3PbTiO(3) (PMN-0.3PT) single crystal. The pyroelectric current and voltage of PININ-0.3PT depend on the electric poling voltage, the temperature-variation rate, and the measurement temperature. Near the structural transition temperatures of the rhombohedraltetragonal transition (similar to 380 K) and the tetragonal-cubic transition (similar to 410 K), the temperatureinduced change in the electric polarization results in a sharp enhancement of the pyroelectric power. Near the tetragonal-cubic transition temperature, i.e., the Curie temperature, we observe a pyroelectric current of similar to 100 nA and voltage of similar to 11 V. Near room temperature, we observe a pyroelectric current of similar to 1.4 nA and voltage of similar to 0.2 V from the touch of a human finger. These results imply that the relaxor fenoelectric PMN-0.3PT should be quite useful for pyroelectric energy-harvesting and temperature-sensing applications.