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Preparation and dielectric properties of Sr(Fe0.5Nb0.5)O3 by coprecipitation method

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Abstract

A coprecipitation synthesis is applied to prepare Sr(Fe0.5Nb0.5)O3 powders for the first time. Pure perovskite phase Sr(Fe0.5Nb0.5)O3 is obtained at relative low calcination temperature of 950 °C. The powder exhibits a nano-size grain (~40 nm) with a relatively uniform particle size and microstructure. The effect of sintering temperature on microstructure and dielectric properties of SFN ceramics are analyzed. Microstructure analysis shows well-grown and dense microstructure in all samples by two-step sintering. The ceramics of SFN sintered at 1,400 °C with very low dielectric loss (0.08) under 1 kHz frequency at room temperature is obtained. The SFN ceramics exhibit frequency stability over a board frequency interval (100 Hz–100 kHz). The dielectric relaxation is a Debye-like relaxation. The relaxation time (τ) well follows the Arrhenius law and the relaxation is a thermal activated process. The decreased value of activation energy with sintering temperature increasing is related to potential barrier height of electron-hopping.

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Acknowledgments

The present work was supported by National Science Foundation of China (51372144, 51102159), the Special Foundation of Educational Department of Shaanxi Province (14JK1080), the Scientific Research Foundation for Ph.D (BJ10-16), the Academic Backbones Cultivation Program (XS11-02) and Graduate Innovation Fund of Shaanxi University of Science and Technology.

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  1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China

    Zhuo Wang, Yong Fei Wen, Hai Juan Li, Ming Rui Fang, Chun Wang & Yong Ping Pu

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  1. Zhuo Wang
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  2. Yong Fei Wen
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Correspondence to Zhuo Wang.

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Wang, Z., Wen, Y.F., Li, H.J. et al. Preparation and dielectric properties of Sr(Fe0.5Nb0.5)O3 by coprecipitation method. J Mater Sci: Mater Electron 26, 769–773 (2015). https://doi.org/10.1007/s10854-014-2462-5

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  • DOI: https://doi.org/10.1007/s10854-014-2462-5

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