摘要
Pyroelectric measurements are conducted during zero-field heating in [001],[110] and [111] poled 0.69Pb(Mg_(1/3)Nb_(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℃,which is much higher than the Curie point (126℃) 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.
作者
ZHAO Liang
SHEN Ming-Rong
CAO Wen-Wu
赵亮;沈明荣;曹文武(Jiangsu Key Laboratory of Thin Films and Department of Physics,Soochow University,Suzhou 215006;Materials Research Institute,The Pennsylvania State University,University Park,Pennsylvania 16802,USA)
