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Effect of A-site cationic radius on polycrystalline ceramics La x Sm0.67−x Sr0.33MnO3 prepared by sol–gel technique

  • Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications
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Abstract

In this paper, polycrystalline ceramics La x Sm0.67−x Sr0.33MnO3 (x = 0.00, 0.10, 0.20, 0.25, 0.30, 0.365, and 0.40) were prepared by sol–gel technique. The structure was tested by X-ray diffraction, which shows that all samples are single phase, but the progressive substitution of Sm3+ by La3+ enlarges the volume of the unit cell. The surface morphology was investigated by scanning electron microscope, which indicates that the samples with better crystallization have higher density. The electrical property was measured by the standard four-probe method, which demonstrates that the resistivity decreases and the metal–insulator transition temperature shifts to higher temperature with increasing La content. Furthermore, the progressive substitution of Sm3+ by La3+ broadens the metal–insulator transition and reduces the temperature coefficient of resistivity. A mechanism based on double exchange is proposed to interpret the results above.

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Acknowledgments

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, China

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

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

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Chen, X., Chen, Q., Jin, F. et al. Effect of A-site cationic radius on polycrystalline ceramics La x Sm0.67−x Sr0.33MnO3 prepared by sol–gel technique. J Sol-Gel Sci Technol 80, 474–479 (2016). https://doi.org/10.1007/s10971-016-4087-z

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  • DOI: https://doi.org/10.1007/s10971-016-4087-z

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