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High-temperature impedance spectroscopy of BaFe0.5Nb0.5O3 ceramics doped with Bi0.5Na0.5TiO3

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Abstract

Bi0.5Na0.5TiO3 (BNT)-doped BaFe0.5Nb0.5O3 (BFN) ceramics were synthesized by a two-step solid-state reaction. Temperature dependence of dielectric properties measured at different frequencies was investigated over broad temperature and frequency ranges. Impedance spectroscopy and universal dielectric response were employed to study the relaxation behavior and conductivity mechanism of the ceramics in a frequency range from 40 Hz to 100 MHz and a temperature range from 300 K to 800 K. The complex plane impedance data revealed the bulk and grain boundary contributions toward conductivity processes in the form of semicircular arcs. The high-temperature conductivity of ceramics is attributable to thermally activated second ionized oxygen vacancy.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of China (51002036, 21061004, and 50962004), by the Natural Science Foundation of Guangxi (C013002, BA053007), by the program for Excellent Talents in Guangxi Higher Education Institutions, and by the Projects of Department of Science and Technology of Guangxi (0842003 and 09-007-02).

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  1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of New Processing Technology for Nonferrous Metal and Materials, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Yanmin Huang, Danping Shi, Laijun Liu, Guizhong Li, Shaoying Zheng & Liang Fang

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  1. Yanmin Huang
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  2. Danping Shi
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  3. Laijun Liu
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  4. Guizhong Li
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Correspondence to Laijun Liu.

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Huang, Y., Shi, D., Liu, L. et al. High-temperature impedance spectroscopy of BaFe0.5Nb0.5O3 ceramics doped with Bi0.5Na0.5TiO3 . Appl. Phys. A 114, 891–896 (2014). https://doi.org/10.1007/s00339-013-7735-y

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