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Journal of Advanced Ceramics

, Volume 5, Issue 4, pp 329–336 | Cite as

Characterization of new negative temperature coefficient thermistors based on Zn–Ni–O system

  • Xiang Sun
  • Hong Zhang
  • Ya Liu
  • Jia Guo
  • Zhicheng Li
Open Access
Research Article

Abstract

Y2O3-doped Zn1-xNi x O (x = 0, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.9) powders were prepared by a wet chemical synthesis method, and the related ceramics were obtained by the traditional ceramic sintering technology. The phases and related electrical properties of the ceramics were investigated. The analysis of X-ray diffraction (XRD) indicates that the prepared ceramics with Ni substitution have a cubic crystalline structure. The resistance–temperature feature indicates that all the ceramics show a typical effect of negative temperature coefficient (NTC) of resistivity with the thermal constants between 3998 and 5464 K, and have high cyclical stability in a temperature range from 25 to 300 °C. The impedance analysis reveals that both grain effect and grain boundary effect contribute collectively to the NTC effect. The electron hopping and band conduction models are proposed for the grain (bulk) conduction, and the thermally activated charge carrier transport overcoming the energy barrier is suggested for the grain boundary conduction.

Keywords

Zn1-xNixthermistors microstructure electrical properties conduction mechanism 

Notes

Acknowledgements

The authors acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51172287) and the Laboratory Research Fund by the State Key Laboratory of Powder Metallurgy, Central South University, China.

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Copyright information

© The Author(s) 2016

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Xiang Sun
    • 1
  • Hong Zhang
    • 1
    • 2
  • Ya Liu
    • 1
  • Jia Guo
    • 1
  • Zhicheng Li
    • 1
    • 2
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina
  2. 2.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina

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