Effect of reduction/oxidation annealing on the dielectric relaxation and electrical properties of Aurivillius Na0.5Gd0.5Bi4Ti4O15 ceramics
Effect of reduction/oxidation annealing on the dielectric relaxation and electrical properties of Aurivillius Na0.5Gd0.5Bi4Ti4O15 ceramics
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还原/氧化退火对Aurivilius Na0.5Gd0.5Bi4Ti4O15陶瓷介电弛豫和电性能的影响
DOI：
10.1039/c6ra04628b
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Li Jing-Bo
中科院分区：
文献类型：
--
作者：
Rehman Fida;Jin Hai-Bo;Li Jing-Bo
采用高温固相反应法制备了铋层状结构的Na0.5Gd0.5Bi4Ti4O15陶瓷。样品分别在纯氩和纯氧气氛下退火。利用介电/阻抗谱研究了该材料在宽频率和温度范围内的介电弛豫和电学性能。在温度相关的介电光谱中观察到两个异常，一个发生在~ 200-400°C范围内，另一个发生在~ 590°C，这是由于铁电相变的发生。低温峰被氧退火明显抑制，而氩退火明显增强，表明其与氧空位有关。阻抗和电模量频谱的组合分析表明，陶瓷表现出单介质弛豫行为，这归因于体贡献。对交流介电数据进行了动力学分析，探讨了可能的传导松弛机制。在~ 400°C以上，化合物的弛豫和传导被分配给电离氧空位的运动。实验结果表明，gd掺杂抑制了Na0.5Bi4.5Ti4O15陶瓷的漏损，改善了陶瓷的介电性能。
Bismuth layer-structured Na0.5Gd0.5Bi4Ti4O15 ceramics were synthesized via a high temperature solid state reaction. The samples were annealed under pure-argon and pure-oxygen atmospheres respectively. The dielectric relaxation and electrical properties were investigated in a wide range of frequencies and temperatures by dielectric/impedance spectroscopies. Two anomalies were observed in the temperature dependent dielectric spectra, one occurred in the range of ∼200–400 °C and the other was at ∼590 °C due to the occurrence of a ferroelectric phase transition. The low temperature peak was suppressed significantly by oxygen-annealing and enhanced by argon-annealing, suggesting it is oxygen-vacancy related. The ceramics exhibited a single dielectric relaxation behavior, which was attributed to the bulk contribution according to the combination analysis of impedance and electric modulus frequency spectra. Kinetic analyses of ac dielectric data were carried out to probe the possible conduction–relaxation mechanisms. Above ∼400 °C, the relaxation and conduction of the compound was assigned to the motion of ionized oxygen vacancies. The experimental results indicated that the Gd-doping suppressed the leakage and improved dielectric properties of Na0.5Bi4.5Ti4O15 ceramics.
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影响因子：
6.2
作者：
Zhihang Peng;Qiang Chen;Jiagang Wu;Dan Liu;D. Xiao;Jianguo Zhu
通讯作者：
Zhihang Peng;Qiang Chen;Jiagang Wu;Dan Liu;D. Xiao;Jianguo Zhu
影响因子：
2.4
作者：
Kumar, Sunil;Varma, K. B. R.
通讯作者：
Varma, K. B. R.
影响因子：
2.8
作者：
Z. Yu;Jian Sun;M. Sullivan;Yong-Wei Zhang;H. Gong;David J. Singh
通讯作者：
Z. Yu;Jian Sun;M. Sullivan;Yong-Wei Zhang;H. Gong;David J. Singh
通过钴改性增强钛酸铋钠（Na0.5La0.5Bi4Ti4O15）的压电性能
DOI：
10.1016/j.mseb.2010.03.076
发表时间：
2010-07
影响因子：
3.6
作者：
Wang, Chun-Ming;Wang, Jin-Feng;Zheng, Li-Mei;Zhao, Ming-Lei;Wang, Chun-Lei
通讯作者：
Wang, Chun-Lei
影响因子：
3.2
作者：
Hiruma, Yuji;Nagata, Hajime;Takenaka, Tadashi
通讯作者：
Takenaka, Tadashi