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Polarization of High‐Permittivity Dielectric NiO‐Based Ceramics
Author(s) -
Lin Yuanhua,
Zhao Rongjuan,
Wang Jianfei,
Cai Jingnan,
Nan CeWen,
Wang Yutian,
Wei Long
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00361.x
Subject(s) - materials science , dielectric , grain boundary , ceramic , permittivity , microstructure , ferroelectricity , polarization (electrochemistry) , ferroelectric ceramics , non blocking i/o , ceramic capacitor , dipole , condensed matter physics , composite material , capacitor , mineralogy , optoelectronics , chemistry , voltage , biochemistry , physics , organic chemistry , quantum mechanics , catalysis
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.