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Electrical properties of perovskite YFeO3 based ceramics modified by Cu/Nb ions as negative temperature coefficient thermistors

  • Yuan Zeng
  • Zhicheng Li
  • Junming Shao
  • Xianchi Wang
  • Wenbin Hao
  • Hong ZhangEmail author
Article
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Abstract

Cu/Nb doped YFeO3 ceramics were synthesized through wet chemical method followed by traditional ceramic sintering technology. The phase component and electrical properties of the ceramics were investigated. The XRD pattern shows that all the prepared ceramics have the orthorhombic perovskite structure with space group of Pnma. The XPS analysis demonstrates the existence of Fe2+ and Fe3+ in the ceramics. The temperature dependence of resistivity indicates that YFeO3-based materials have a characteristics of negative temperature coefficient (NTC) of resistivity. The room temperature resistivities (306–1.52 × 105 Ω cm) and temperature sensitivity B values (2693–5395 K) can be effectively adjusted by changing the contents of Cu- and Nb- ions. According to the analysis of complex impedance spectra at various temperatures, the NTC characteristic could be attributed to grain effect and grain boundary effect. The possible conduction mechanisms are propose to hopping conduction and band conduction in grain, and thermal activation transport of charge carries in grain boundary.

Notes

Acknowledgements

This work is supported by the research funding from the Hunan Wedid Materials Technology Co., Ltd. (Grant No. 738010241) and the National Natural Science Foundation of China (Grant No. 51767021).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Yuan Zeng
    • 1
  • Zhicheng Li
    • 1
  • Junming Shao
    • 1
  • Xianchi Wang
    • 1
  • Wenbin Hao
    • 1
  • Hong Zhang
    • 1
    Email author
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina

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