PZT铁电陶瓷的氢致半导体化

研究了锆钛酸铅铁电陶瓷（PZT-5H）的氢致半导体化现象.结果表明,随试样中氢浓度的升高,漏电电流和载流子浓度升高,电阻率下降,颜色由黄变黑.即氢能使PZT-5H铁电陶瓷从绝缘体变成n型半导体.高于Curie点充氢时,能抑制PZT-5H从立方的顺电相向四方的铁电相的转变,室温下铁电性消失.但室温电解充氢并不抑制相变.高温除氢后试样的性能及颜色均恢复.

HYDROGEN-INDUCED SEMICONDUCTOR TRANSFORMATION OF PZT FERROELECTRIC CERAMICS

Semiconductor transformation of PZT-5H ferroelectric ceramics induced by hydrogen has been investigated. The results showed that the leakage current and carrier concentration increased and the resistivity decreased with increasing hydrogen concentration, and the color of specimen changed from yellow to black. Hydrogen could induce a transition of the insulating PZT-5H ferroelectric ceramics to n-type semiconductor. During charging in H2 at the temperature higher than the Curie point, hydrogen would restrain the phase transformation from cubic to tetragonal, resulting in disappearance of ferroelectricity at room temperature. Charging at room temperature, however, did not change the crystal structure of the tetragonal ferroelectric ceramics. The properties and color of PZT-5H were reinstated after outgassing at high temperature.