Pyroelectric measurements are conducted during zero-field heating in ,  and  poled 0.69Pb(Mg 1/3Nb 2/3)O 3-0.31PbTiO 3 single crystals. Compared to the room-temperature-poled samples, the crystals poled by using the field cooling method show broad but well recognizable pyroelectric current peaks near 190°C, which is much higher than the Curie point (126°C) of the crystal. We propose that this peak of the crystals poled by field-cooling above the Curie point is ascribed to the order-disorder transition of the dipoles in polar nano-regions formed at the Burns temperature.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)