Electrical reliability and leakage mechanisms in highly resistive multiferroic La0.1Bi0.9FeO3 ceramics
Electrical reliability and leakage mechanisms in highly resistive multiferroic La0.1Bi0.9FeO3 ceramics
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DOI：
10.1063/1.3580604
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发表时间：
2011-04
影响因子：
4
通讯作者：
Shanyong Wang;X. Qiu;J. Gao;Yu Feng;W. Su;J. Zheng;D. Yu;Dejun Li
中科院分区：
文献类型：
--
作者：
Shanyong Wang;X. Qiu;J. Gao;Yu Feng;W. Su;J. Zheng;D. Yu;Dejun Li
采用改进的快速热法合成了高阻La0.1Bi0.9FeO(LBFO)复相陶瓷。LBFO陶瓷具有极低的漏电和介电损耗。观察到了饱和的铁电磁滞回线和极化转换电流。当最大外加电场为145kV/cm时，剩余极化为17.8kVC/cm~2，矫顽场为75kV/cm。在LBFO陶瓷中，主要的导电机制是空间电荷限制电流机制，而不是热激发机制。文中还讨论了与LBFO陶瓷的疲劳和极化保持有关的电可靠性，并讨论了其漏电机制。
Multiferroic La0.1Bi0.9FeO3 (LBFO) ceramics with high resistivity were synthesized by using a modified rapid thermal process. The LBFO ceramics show very low leakage and low dielectric loss. Well saturated ferroelectric hysteresis loops and polarization switching currents have been observed. For a maximum applied electric field of 145 kV/cm, the remanent polarization is 17.8 μC/cm2 and the coercive filed is 75 kV/cm. The dominant conduction mechanism in the LBFO ceramics has been found to be the space-charge-limited current mechanism rather than the thermal excitation mechanism. Electrical reliability related to the fatigue and polarization retention of the LBFO ceramics has also been discussed with the leakage mechanisms.