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Erschienen in:
01.02.2015
Preparation and dielectric properties of Sr(Fe0.5Nb0.5)O3 by coprecipitation method
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 2/2015
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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.