锆钛酸铅系陶瓷的低温原子氢致电导改性研究

he conductance modification in lead zirconate titanate ceramics (PZT) with different PbO contents induced by atomic hydrogen at low temperature was investigated in this study. PbO-depleted, stoichiometric and PbO-rich PZT samples were prepared. Atomic hydrogen charging was carried out in aqueous solution under ultrasonic vibration at room temperature. The results showed that the resistivity decrease became slower with increasing hydrogen charging time. Upon the same hydrogen-charging treatment, the resistivity of the PbO-depleted samples decreased the most whereas that of the PbO-rich ones decreased the least. The XRD analysis demonstrated that the the PZT samples remained the tetragonal structure and the volumes of unit cells increased slightly, which indicates that hydrogen atoms invaded into the PZT lattice. Based on our results, the mechanism of the conductance modification was also discussed. It was proposed that hydrogen entered into PZT lattice as interstitial atoms and offered a donor level. As a result, the resistivity of the samples decreased with increasing hydrogen charging time.