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New negative temperature coefficient thermistor ceramics in (Y2O3 + CeO2)–LaCr0.5Mn0.5O3 composite system

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Abstract

A new series of composite, negative temperature coefficient (NTC) ceramics based on the (aY2O3 + bCeO2)−0.4LaCr0.5Mn0.5O3 (a + b = 0.6) were carefully prepared and related electrical properties were investigated. All the NTC thermistors showed a linear relationship between the natural logarithm of the resistance and the reciprocal of the absolute temperature, indicative of NTC characteristics. The obtained B 25/85 constants were in range of 2,100–2,700 K. The magnitude order of the resistivity at 25 °C was of 103–109 Ωcm and activation energies varied from 0.185 to 0.231 eV. The aging coefficient of the NTC thermistors with CeO2 was less than 2 % for the time period of 900 h, suggesting that NTC thermistors with CeO2 possessed a better electrical stability in comparison with CeO2-free thermistors.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant No. 51102276), and the National High Technology Research and Development Program of China (Grant No. 2012AA091102).

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Authors and Affiliations

  1. Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi, 830011, China

    Qing Zhao, Bo Zhang, Jincheng Yao, Pengjun Zhao & Aimin Chang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Qing Zhao, Bo Zhang, Jincheng Yao & Pengjun Zhao

Authors
  1. Qing Zhao
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  2. Bo Zhang
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  3. Jincheng Yao
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  4. Pengjun Zhao
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  5. Aimin Chang
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Correspondence to Aimin Chang.

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Zhao, Q., Zhang, B., Yao, J. et al. New negative temperature coefficient thermistor ceramics in (Y2O3 + CeO2)–LaCr0.5Mn0.5O3 composite system. J Mater Sci: Mater Electron 25, 3023–3027 (2014). https://doi.org/10.1007/s10854-014-1977-0

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  • DOI: https://doi.org/10.1007/s10854-014-1977-0

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