Excellent stability and low dielectric loss of Ba(Fe sub(0.5)Nb sub(0.5))O sub(3) synthesized by a solution precipitation method

A solution precipitation method was applied to prepare Ba(Fe sub(0.5)Nb sub(0.5))O sub(3) powders. Nano-size BFN powders with uniform particles size ( similar to 40 nm) were synthesized by solution precipitation method, which is beneficial to calcine at low temperature (1223 K). The sintering sample...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-01, Vol.656, p.431-438
Main Authors: Wang, Zhuo, Wen, Yong Fei, Li, Hai Juan, Fang, Ming Rui, Wang, Chun, Pu, Yong Ping
Format: Article
Language:English
Subjects:
Alloys
Ceramics
Dielectric constant
Dielectric loss
Grain boundaries
Grain size
Precipitation (chemistry)
Stability
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Summary:A solution precipitation method was applied to prepare Ba(Fe sub(0.5)Nb sub(0.5))O sub(3) powders. Nano-size BFN powders with uniform particles size ( similar to 40 nm) were synthesized by solution precipitation method, which is beneficial to calcine at low temperature (1223 K). The sintering sample with dense microstructure and uniform grain size (15 mu m) was obtained at 1673 K, which exhibits enhanced dielectric properties. The dielectric loss of BFN ceramic could be significantly reduced by solution precipitation method. The frequency and temperature stability of BFN ceramics could also be improved. The complex impedance spectroscopy analysis results suggested that the obtained Ba(Fe sub(0.5)Nb sub(0.5))O sub(3) ceramics, consisting of semiconducting grains and insulating grain boundaries, were electrically heterogeneous. The grain boundary effect was responsible for such a high value of dielectric constant.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2015.09.169