Hydrogen-induced degradation in CaCu3Ti4O12 ceramics
Hydrogen-induced degradation in CaCu3Ti4O12 ceramics
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DOI：
10.1016/j.jallcom.2005.12.013
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发表时间：
2006-09
影响因子：
6.2
通讯作者：
W. Chen;W. Xiang;Minghao Guo;W. You;Xingzhong Zhao;H. Chan
中科院分区：
文献类型：
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作者：
W. Chen;W. Xiang;Minghao Guo;W. You;Xingzhong Zhao;H. Chan
采用电化学充氢法研究了CaCu3Ti4O 12（CTO）陶瓷的氢致降解。在0.01M NaOH溶液中，以CTO陶瓷颗粒的银电极为阴极，电解水产生存款氢。处理后的介质损耗大大增加，绝缘电阻大大降低。X射线衍射分析表明，没有新的相形成。提出氢原子扩散到CCTO晶格中，并通过氢原子电离形成自由电子，从而导致观察到的退化。氢致CTO陶瓷材料的氢致老化发生得非常快，因此防止氢致CTO陶瓷材料的氢致老化是非常重要的。
Hydrogen-induced degradation in CaCu3Ti4O12(CCTO) ceramics was studied using an electrochemical hydrogen charging method, in which the silver electrodes of CCTO ceramic pellets were made a cathode in 0.01M NaOH solution to deposit hydrogen through the electrolysis of water. The dielectric loss was greatly increased and the insulation resistance was greatly decreased after the treatment. X-ray diffraction analysis showed that no new phases were formed. It is proposed that atomic hydrogen is diffused into CCTO lattice and free electrons are formed through the ionization of hydrogen atoms, which lead to the observed degradation. Hydrogen-induced degradation occurs very quickly in CCTO ceramics and it is important to prevent hydrogen-induced degradation in CCTO ceramics.