We present a Li and Ti codoped NiO-based polycrystalline ceramic with high-permittivity dielectric properties. Analysis of the ceramic microstructure and composition proves that obvious grain boundaries are formed. The measurements of frequency and temperature dependence of impedance and dielectric permittivity indicate that the grain and grain boundaries have remarkable influence on the dielectric properties due to the various activation energies corresponding to the dielectric relaxation processes. Our results also demonstrate that the activation energy required for relaxation E-a is almost the same to the activation energy of the conductivity in the grain interiors E-g.(c) 2006 American Institute of Physics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据