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LaAlO3: a new high-temperature negative temperature coefficient thermistor

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Abstract

In this study, the electrical properties of LaAlO3 prepared via spark plasma sintering (SPS) technique at 1650, 1700, and 1750 °C, are studied for the first time. X-ray diffraction (XRD) results show that sintered samples are pure phase lanthanum aluminate. The electrical characteristics of sintered samples are measured through direct resistance–temperature (R–T) and AC impedance method. According to the R-T results illustrate, sintered samples show a typical NTC characteristic in two temperature ranges of 200 °C to 400 °C and 600 °C to 800 °C, with resistivity ρ200 from 7.23 × 1010 Ω·cm to 1.71 × 1011 Ω·cm, B200/400 from 8903 to 9547 K, and B600/800 from 17,477 to 20,331 K. According to AC impedance results, a conduction mechanism-based small polarons and oxygen vacancies work in LaAlO3 from 200 to 400 °C and from 600 to 800 °C. These results reveal that LaAlO3 is a promising material for high-temperature NTC thermistors.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51862028, No. 52104358) and Natural Science Foundation of Ningxia (No. 2021AAC03219, No. 2020AAC03005).

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Authors and Affiliations

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

    Xiao Zhang & Wei Chu

  2. Key Laboratory of Ningxia for Photovoltaic Materials, Ningxia University, Yinchuan, 750021, China

    He Bai & Sen Liang

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  1. Xiao Zhang
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Contributions

XZ and WC contributed to analysis and manuscript preparation; WC and HB performed the experiment; and SL contributed to the conception of the study. All the authors have read and approved the final manuscript.

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Correspondence to Sen Liang.

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Zhang, X., Chu, W., Bai, H. et al. LaAlO3: a new high-temperature negative temperature coefficient thermistor. J Mater Sci: Mater Electron 33, 12093–12103 (2022). https://doi.org/10.1007/s10854-022-08169-x

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