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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Study of domain depinning during repeated polarization reversal in hard PZT ceramics using acoustic emission
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Study of domain depinning during repeated polarization reversal in hard PZT ceramics using acoustic emission

机译：利用声发射研究硬质PZT陶瓷反复极化反转过程中的畴钉扎

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摘要

Acoustic emission (AE) has been studied during repeated polarization reversals (at 50 Hz) in hard PZT-8 ceramics. The AE and hysteresis loop were monitored at regular intervals of electric field (+/- 20 kV cm(-1) peak) application till 10(8) cycles. The sample did not fatigue and an increase in saturation polarization (Ps) was observed. AE was observed with zero threshold till 10(5) cycles when the field was increasing in both half cycles of the applied field. The initial increase in AE activity with increasing number of field cycles till 105 was explained on the basis of defect dipoles encouraging the 90 degrees. domain switches, i.e. domain depinning. The decrease in AE activity, an increase in threshold field for the observed AE and a further increase in Ps after 10(5) cycles were explained based on the changes in the orientation of defect dipoles with respect to Ps due to the applied field cycles. This was found to encourage the 180 degrees. domain switches but pin the 90 degrees. domains. An increase in AE at 10(8) cycles after applying a higher field of +/- 25 kV cm(-1) was found to be mainly due to microcracking.
机译：在硬质PZT-8陶瓷中反复进行极化反转（50 Hz）时，已经研究了声发射（AE）。在有规律的电场间隔（+/- 20 kV cm（-1）峰值）下监测AE和磁滞回线，直到10（8）个循环。样品没有疲劳并且观察到饱和极化（Ps）增加。当电场在所施加磁场的两个半周期都增加时，观察到AE的阈值为零，直到10（5）个周期。 AE活性的最初增加是随着磁场周期数增加到105，这是基于缺陷偶极子激发90度的结果进行解释的。域切换，即域固定。根据缺陷偶极子相对于Ps的取向因施加的磁场周期而发生的变化，解释了AE活性的降低，所观察到的AE的阈值场的增加以及Ps的进一步增加。发现这鼓励了180度。域切换，但固定90度。域。发现在施加+/- 25 kV cm（-1）的较高电场后，在10（8）个循环中AE的增加主要归因于微裂纹。

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