Polarization of High‐Permittivity Dielectric NiO‐Based Ceramics
Polarization of High‐Permittivity Dielectric NiO‐Based Ceramics
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DOI：
10.1111/j.1551-2916.2005.00361.x
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发表时间：
2005-07
影响因子：
3.9
通讯作者：
Yuanhua Lin;Rongjuan Zhao;Jianfei Wang;Jingnan Cai;C. Nan;Yutian Wang;Long Wei
中科院分区：
文献类型：
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作者：
Yuanhua Lin;Rongjuan Zhao;Jianfei Wang;Jingnan Cai;C. Nan;Yutian Wang;Long Wei
研究了Li、Ti共掺杂NiO（LTNO）陶瓷的极化和介电行为。陶瓷的显微结构和成分分析表明，陶瓷中形成了明显的晶界，Ti离子分布在晶粒和晶界上。Ti含量对LTNO陶瓷的介电性能有显著影响。正电子湮没谱测量表明，LTNO陶瓷样品中存在大量的缺陷。在高介电常数LTNO陶瓷中观察到与铁电材料完全不同的反常极化-电场电滞回线，这是由于缺陷偶极子的引入，样品的导电效应也会对电滞回线产生影响。LTNO陶瓷的高介电常数响应的增强部分是由边界层电容机制，部分是由大量的缺陷偶极子的巨大的极化。
Polarization and dielectric behavior of Li and Ti co-doped NiO (LTNO) ceramics was investigated. Analysis of the ceramic microstructure and composition indicate that an obvious grain boundary was formed and surrounded the grains, and Ti ions distributed in grains and grain boundaries. The concentration of Ti had a remarkable effect on the dielectric properties of the LTNO ceramics. Positron annihilation spectra measurements implied that a large amount of defects exist in the LTNO ceramic samples. Anomaly polarization–electric field hysteresis loops were observed in the high-permittivity dielectric LTNO ceramics, which are totally different from those for ferroelectric materials and are due to defect-dipoles induced, and electrical conduction effects of samples could also have an influence on the hysteresis loops. The high dielectric constant response of the LTNO ceramics is enhanced partially by the boundary layer capacitor mechanism, and partially by the huge polarization of a large amount of defect dipoles.