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Effect of heat treatment on performance of high-temperature thermistor LaCrO3

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Abstract

In this study, pure LaCrO3 ceramic as the negative temperature coefficient (NTC) thermistors were investigated. NTC LaCrO3 powder with an average particle size of 80 nm was prepared using the sol–gel method, and LaCrO3 ceramic samples with a relative density spanning from 92.8 to 95.6% were prepared using spark plasma sintering (SPS) at 1450, 1500, and 1600 °C. The LaCrO3 samples were then heat-treated at 1300 °C in an air atmosphere for 2 h. Before heat treatment, the values of room temperature resistivity were between 1.34 × 109 and 2.59 × 109 Ω·cm; material constant between 4418 and 4575 K; and activation energy between 0.6099 and 0.6316 eV. After heat treatment, the resistivity was from 2.19 × 105 to 1.54 × 106 Ω·cm, material constant from 2539 to 2808 K, and activation energy from 0.3505 to 0.3876 eV. This combination of properties renders pure LaCrO3 materials an excellent candidate system for application as NTC thermistors in the high-temperature range of 200–800 °C.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (No. 52372112, 52104358, U22A20147), and Key Research and Development Program of Ningxia (No. 2023BDE03008).

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Authors and Affiliations

  1. School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China

    Xiao Zhang, Jianyun Hu, Siyi Li, Yun Chen, Pinyi Wang, Guangcan Yang & Wei Chu

  2. College of Physics and Information Engineering, Institute of Micro-Nano Devices and Solar Cells, Fuzhou University, Fuzhou, 350108, China

    Yun Chen

  3. School of Materials and New Energy, Ningxia University, Yinchuan, 750021, China

    Sen Liang

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Contributions

All authors contributed to the study conception and design. Conceptualization: Xiao Zhang, Sen Liang; Carriying the experiments: Jianyun Hu, Siyi Li, Yun Chen, Wei Chu; Formal analysis and investigation:Pinyi Wang, Guangcan Yang; Writing—original draft preparation: Yun Chen, Jianyun Hu; Writing—review and editing: Xiao Zhang, Yun Chen; Funding acquisition: Xiao Zhang, Sen Liang.All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Sen Liang.

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Zhang, X., Hu, J., Li, S. et al. Effect of heat treatment on performance of high-temperature thermistor LaCrO3. J Mater Sci: Mater Electron 35, 1726 (2024). https://doi.org/10.1007/s10854-024-13476-6

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