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Improvement in electronic and magnetic transport of La0.67Ca0.33MnO3 manganites by optimizing sintering temperature

  • Original Paper: Fundamentals of sol-gel and hybrid materials processing
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Abstract

La0.67Ca0.33MnO3 samples with high temperature coefficient of resistance have been synthesized by sol-gel method using methyl alcohol as solvent. Nitrates of La, Ca and Mn were heated with a controlled amount of methyl alcohol to get a dry powder which on suitable heat treatment gave high grade La0.67Ca0.33MnO3 powder/pellets. The samples were sintered in the temperature varied from 1000 °C to 1550 °C. The effects of sintering temperature (T s) on phase purity, microstructure, morphology, electrical and magnetic transport properties have been investigated. The results confirm that elevated sintering temperature at sintering processing accelerates the growth of the specimen grains, influence microstructure and improves chemical homogeneity, which leads to the increased lattice distortion and thus contributes to the enhancement of magneto-resistance. The reduction of the grain boundaries contributes to the reduction of resistivity and the enhancement of the coefficient of resistance. The increase of the oxygen vacancy induced by the increase of T s will lead to monotonous decrease of the metal-insulator transition temperature (T p), the peak of temperature for the maximum temperature coefficient of resistance (T k) and for the peak of maximum magneto-resistance (T m).

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Acknowledgments

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

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Authors and Affiliations

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

    Fei Jin, Hui Zhang, Xiaohui Chen, Xiang Liu & Qingming Chen

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  1. Fei Jin
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  2. Hui Zhang
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  3. Xiaohui Chen
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  4. Xiang Liu
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  5. Qingming Chen
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Correspondence to Qingming Chen.

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Jin, F., Zhang, H., Chen, X. et al. Improvement in electronic and magnetic transport of La0.67Ca0.33MnO3 manganites by optimizing sintering temperature. J Sol-Gel Sci Technol 81, 177–184 (2017). https://doi.org/10.1007/s10971-016-4186-x

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  • DOI: https://doi.org/10.1007/s10971-016-4186-x

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