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Electrical properties of hexagonal BaTi1−x Fe x O3−δ (x = 0.1, 0.2, 0.3) ceramics with NTC effect

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Abstract

BaTi1−x Fe x O3−δ (x = 0.1, 0.2, 0.3) powders were prepared by a wet chemical process polymerized with polyvinyl alcohol, and the related ceramics were obtained by conventional sintering process. The phase component and electrical properties of the ceramics were investigated. The analysis of X-ray diffraction indicates that the BaTi1−x Fe x O3−δ ceramics have a hexagonal crystalline structure. The temperature dependence of resistivity of the ceramics show a characteristic of negative temperature coefficient (NTC) of resistivity with the material constants of around 5,000 K. The impedance analysis reveals that both the grain effect and grain-boundary effect contribute simultaneously to the NTC effect. The conduction mechanisms for the NTC characteristic are proposed to be the electron-hopping model between Fe3+/Fe2+ ions inside grains and the charge carrier transports overcoming the energy barrier of the grain boundary by thermal activation.

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Acknowledgments

The authors acknowledge the support of the National Natural Science Foundations of China (Nos. 50872155 and 51172287).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Dan Xue, Hong Zhang, Yiyu Li, Yulong Liu & Zhicheng Li

  2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Hong Zhang & Zhicheng Li

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  1. Dan Xue
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  2. Hong Zhang
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Correspondence to Zhicheng Li.

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Xue, D., Zhang, H., Li, Y. et al. Electrical properties of hexagonal BaTi1−x Fe x O3−δ (x = 0.1, 0.2, 0.3) ceramics with NTC effect. J Mater Sci: Mater Electron 23, 1306–1312 (2012). https://doi.org/10.1007/s10854-011-0589-1

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