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Exploring the electrical transport properties of La0.67Ca0.33MnO3 at different sintering temperatures

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Abstract

The La0.67Ca0.33MnO3 polycrystalline ceramics were prepared by the co-precipitation method with ammonium carbonate as the precipitant and the influence of the sintering temperature on the electrical transport properties of the ceramics were investigated. XRD results show that the ceramic structures obtained are all perovskite structures, which belong to the Pnma space group. Scanning electron microscopy (SEM) photographs demonstrated that the average size of the grains with the sinter temperature increased from 5.78 μm at 1300 °C to 24.04 μm at 1475 °C. Meanwhile, when the sintering temperature reached 1450 °C, the TCR reached the maximal value (32.3%·K−1), which was much larger r than the TCR at 1350 °C. The theoretical model analysis of the data leads to the conclusion that the conductive mechanism of the low-temperature metallic region and the high-temperature insulating region is dominated by the grain boundary scattering effect and the small-polariton hopping (SPH), respectively.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No.11564021).

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Longfei Qi, Yule Li, Ping Yu, Xiaojin Wang, Yingjuan Li, Yan Gao, Yunrui Yang, Dingzhang Wu, Hui Zhang & Qingming Chen

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Qi, L., Li, Y., Yu, P. et al. Exploring the electrical transport properties of La0.67Ca0.33MnO3 at different sintering temperatures. J Mater Sci: Mater Electron 32, 14164–14173 (2021). https://doi.org/10.1007/s10854-021-05943-1

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