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Structure and magnetoelectric properties of Gd-doped La0.7Ca0.3MnO3 polycrystalline ceramics

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Abstract

The temperature coefficient of resistance (TCR) and magnetoresistive (MR) properties of materials have a large impact on the performance of devices such as infrared sensors and magnetic storage systems. Herein, to develop materials with high TCR and MR properties that can be used in a more practical way in these devices, a series of La0.7−xGdxCa0.3MnO3 (x = 0, 0.015, 0.03, 0.045, 0.06, 0.09) polycrystalline ceramics were synthesized by the sol–gel method. The results show that the unit cell volume of the samples decreases gradually with the increase of the element doping ratio. A maximum TCR of 44.84%·K−1 (0 T) and an MR of 84.79% (1 T) were achieved at doping levels x = 0.03 and x = 0.045, respectively. Compared with the base sample La0.7Ca0.3MnO3 (LCMO), its TCR and MR have been improved by 10% and 30%, respectively. The analysis shows that for LCMO, the doping of gadolinium decreases the average ionic radius at the A-site, leading to a decrease in the unit cell volume and a decrease in the single-electron energy band width. These changes improve the magnetoelectric transport properties of La0.7Ca0.3MnO3 materials within a certain doping range. This study further enriches the effect of doping on the magnetoelectric transport properties of LCMO material systems and provides an aid for the preparation of LCMO materials with high TCR and high MR.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 1156402)

Funding

Funding was provided by 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, Yunnan, China

    Jingang Guo, Yule Li, Junfeng Li, Hui Zhang & Qingming Chen

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  1. Jingang Guo
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  2. Yule Li
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  3. Junfeng Li
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  4. Hui Zhang
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  5. Qingming Chen
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JG, YL and JL. The first draft of the manuscript was written by JG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Hui Zhang.

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Guo, J., Li, Y., Li, J. et al. Structure and magnetoelectric properties of Gd-doped La0.7Ca0.3MnO3 polycrystalline ceramics. J Mater Sci: Mater Electron 33, 22068–22076 (2022). https://doi.org/10.1007/s10854-022-08962-8

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