EFFECT OF HYDROGEN ON DIELECTRIC AND FERROELECTRIC PROPERTY OF PZT FERROELECTRIC CERAMICS

摘要

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 cause the insulating PZT-5H ferroelectric ceramics transited to an n-type semiconductor. During charging in H2 at the temperature higher than Curie point, hydrogen would restrain the phase transformation from cubic to tetragonal, resulting in disappearance of ferroelectricity at room temperature. Charging at room, 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.