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The investigation of Zn content on the structure and electrical properties of Zn x Cu0.2Ni0.66Mn2.14−x O4 negative temperature coefficient ceramics

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Abstract

The effects of Zn content on the structure and electrical properties of Cu–Ni–Mn–O based negative temperature coefficient thermistors were investigated. Series of Zn x Cu0.2Ni0.66Mn2.14−x O4 (0 ≤ x ≤ 1) ceramics were prepared by Pechini method. Cu2p3/2 X-ray photoelectron spectra demonstrate that Cu+ and Cu2+ ions at A sites decrease with increase of x, and all the Cu ions exist as Cu2+ (B) at x of 1.0 due to the almost exclusive occupation of Zn ions at A sites. X-Ray diffraction spectra show that a single cubic spinel structure is formed at a low Zn content (x ≤ 0.6), and NiO and CuO start to appear at x of 0.8. The segregation of NiO at x ≥ 0.8 is caused by the migration of Cu ions for A to B sites. With Zn content x increasing from 0 to 1.0, the electrical resistivity increases from 42 to 980 Ω cm which can be attributed to the decrease of the electrical conduction caused by Cu ions at A sites. The resistivity drift decreases sharply from 12.6 to 4.2% with increasing x from 0 to 0.4, and the value is only 0.16% at x of 1.0.

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Acknowledgments

This work is supported by National Natural Science Foundation of China (Grant no.: 51102094), Research Fund for the Doctoral Program of Higher Education of China (Grant no.: 20110074120013), Visiting Scholar Foundation of The Key Laboratory for Ultrafine Materials of The Ministry of Education, Foundation for University Young teachers of Shanghai, and Youth foundation of ECUST.

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Authors and Affiliations

  1. The Key Laboratory for Ultrafine Materials of the Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

    C. Zhao

  2. College of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    Y. Zhao

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  1. C. Zhao
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  2. Y. Zhao
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Correspondence to C. Zhao.

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Zhao, C., Zhao, Y. The investigation of Zn content on the structure and electrical properties of Zn x Cu0.2Ni0.66Mn2.14−x O4 negative temperature coefficient ceramics. J Mater Sci: Mater Electron 23, 1788–1792 (2012). https://doi.org/10.1007/s10854-012-0663-3

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  • DOI: https://doi.org/10.1007/s10854-012-0663-3

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