Dielectric relaxation of NKN-BNT porous green body

Dielectric relaxation of NKN-BNT porous green body
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NKN-BNT多孔生坯的介电弛豫

DOI:
10.1016/j.proeng.2011.12.522
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发表时间:
2012
期刊:
Procedia Engineering
影响因子:
--
通讯作者:
Liang Fang
Liang Fang
中科院分区:
其他
文献类型:
--
作者:
Laijun LIU;Meixia Wu;Zhao Yang;Huiqing Fan;Liang Fang

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采用机械合金化法制备了0.98Na0.5K0.5NbO3 -0.02Bi0.5Na0.5TiO3 (NKNBNT)纳米粉体。由于表面缺陷和Na、K离子的吸湿作用,NKNBNT颗粒和颗粒表面的水分子成为绝缘体/导体体系。在250 ~ 450K范围内存在较大的非德拜弛豫。其介电常数比纯NKN陶瓷高3-4个数量级。这种弛豫包括三个区域,介电常数的最大值在渗流值附近。这种多孔复合材料有望用作超级电容器或防潮装置。
0.98Na0.5K0.5NbO3 –0.02Bi0.5Na0.5TiO3 (NKNBNT) nano-powder was fabricated by mechanical alloying method. The NKNBNT particle and water molecular on the particle surface became an insulator/ conductor system because of the surface defect and moisture absorption of Na and K ions. A large non-Debye relaxation was found in the range of 250 to 450K in this system. Its dielectric constant is higher 3-4 order of magnitude than that of pure NKN ceramics. This relaxation includes three regions, and the maximum of dielectric constant is near percolation value. This porous composite is expected to be used as a super capacitor or moisture device.
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