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Improved room‐temperature TCR and MR of La0.9−xKxCa0.1MnO3 ceramics by A-sites vacancy and disorder degree adjustment

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Abstract

Herein, polycrystalline La0.9−xKxCa0.1MnO3 (LKCMO) ceramics (A-sites = La, K, and Ca, 0.05 ≤ x ≤ 0.25) are successfully synthesized via the sol–gel process. The effects of vacancy and disorder degree (δ2) of A-sites cations on electromagnetic transport properties are investigated and performed by using a combination of double-exchange (DE) mechanism, phenomenological percolation (PP) model and Jahn–Teller (JT) effects. The results show that K+ ions, occupying the A-sites, leading to the A-sites vacancy and δ2 of A-sites cations, significantly influence the DE mechanism, JT effect and PP model. A-sites vacancy is confirmed by energy-dispersive spectroscopy and X-ray photoemission spectroscopy. The simultaneous presence of La3+, Ca2+ and K+ ions at A-sites influenced the δ2 of A-sites cations. At the optimal doping content x = 0.15, the maximum temperature coefficient of resistivity (TCR) is 9.7% K− 1 at 291.4 K, and the maximum magnetoresistance (MR) value is 35.2% at 295.03 K, respectively. In summary, LKCMO ceramics achieve room-temperature TCR and MR by A-sites vacancy and δ2 of A-sites cations adjustment, promising applications in uncooled infrared bolometer and magnetic sensors.

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Acknowledgements

Many thanks to the support of the National Natural Science Foundation of China (Grant No. 11674135), the Analysis and Testing Foundation of Kunming University of Science and Technology.

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  1. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Zhiyuan Yu, Hongjiang Li, Zhidong Li, Xiaohan Yu, Shuaizhao Jin, Xiaoli Guan, Hui Zhang, Qingming Chen & Xiang Liu

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  1. Zhiyuan Yu
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  2. Hongjiang Li
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Yu, Z., Li, H., Li, Z. et al. Improved room‐temperature TCR and MR of La0.9−xKxCa0.1MnO3 ceramics by A-sites vacancy and disorder degree adjustment. J Mater Sci: Mater Electron 32, 8848–8862 (2021). https://doi.org/10.1007/s10854-021-05558-6

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