Abstract
Abstract In order to accurately evaluate the service life and failure mechanism of the PZT piezoelectric ceramics, the electric degradation process of the PZT ceramics with and sans doping under a DC voltage of 380V, in a surrounding environment of 90∘C and 85% RH has been investigated using a self-made device. The experimental results show that the degradation rate of the pure PZT ceramic is lower than that of ceramics with doping in the same condition. Furthermore, the electrical properties of the ceramics tend to decrease during the electric degradation. The doping increases the defects of ceramics, resulting in that the silver ion transfer from the anode to the cathode under the continuous DC bias, which can further form a metal band, increasing the conductivity, but deteriorating the service life.
Highlights
The Lead-zirconate-titanate (PZT) based piezoelectric ceramics are widely applied in various electronic devices because of their excellent electrical properties and low price [1]
It can be suggested that the soft Nb5+ doping can accelerate the electric degradation rate of piezoelectric ceramics because high amounts of defects were formed in the Nb5+-doping ceramics, resulting in the increase of carrier numbers
It was found that the electrical degradation rate of undoped PZT samples was slower than that of doped PZT ceramic
Summary
The Lead-zirconate-titanate (PZT) based piezoelectric ceramics are widely applied in various electronic devices because of their excellent electrical properties and low price [1]. Developing a completely new equipment platform to estimate the service life to deeply understand the failure mechanism has a profound promotion on the commercial applications of the piezoelectric components. The PZT ceramics with Nb5+ and Sb3+ doping has been prepared using a traditional solid reaction. Their electric degradation process under a DC voltage of 380V, in a surrounding of 90∘C and 85% RH has been investigated using a self-made device through collecting and analyzing the leakage currents.
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