Ba(Fe0.5Nb0.5)O-3@SiO2 core-shell structures with low dielectric loss over a broad frequency and temperature by aqueous chemical coating approach
Ba(Fe0.5Nb0.5)O-3@SiO2 core-shell structures with low dielectric loss over a broad frequency and temperature by aqueous chemical coating approach
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Ba(Fe0.5Nb0.5)O-3@SiO2 核壳结构通过水性化学涂层方法在宽频率和温度范围内具有低介电损耗
DOI：
10.1016/j.jallcom.2017.12.191
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发表时间：
2018
影响因子：
6.2
通讯作者：
Pu Yongping
中科院分区：
文献类型：
--
作者：
Wang Zhuo;Wang Chun;Wang Tian;Xiao Yujia;Pu Yongping
To decrease the dielectric loss over a broad temperature and frequency of Ba(Fe0.5Nb0.5)O3(BFN) ceramics, the core-shell structure of Ba(Fe0.5Nb0.5)O3@SiO2(BFN@SiO2) particles were successfully prepared by aqueous chemical coating approach, which still remains in the final ceramics. The mechanism of coating BFN with SiO2is also analyzed. The BFN@SiO2sample shows good frequency and temperature stability on dielectric constant and the dielectric loss is significantly decreased. The low tanδis related to the homogeneous fine grains and the insulating grain boundaries of BFN@SiO2ceramics. The improved temperature stability in BFN@SiO2ceramics is a competing balance result of the low and high temperature dielectric relaxations. The enhancement resistance of grain boundaries plays a key role to reduce the dielectric loss of the BFN@SiO2ceramics. The XPS analysis confirms the blocking function of insulating SiO2shell on loss of the oxygen and matter transfer.
