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Study on the Effect of Vacancy Doping on the Magnetocaloric Effect of La0.65−xCa0.35MnO3 (0 ≤ x ≤ 0.15)

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Abstract

A series of vacant doping samples of La0.65−xCa0.35MnO3 (x = 0, 0.05, 0.10, 0.15) were prepared by sol-gel method. XRD analysis results show that all samples are a single-phase perovskite structure; XRD refinement demonstrates that La0.50Ca0.35MnO3 is a single phase with the space group Pbnm. When x = 0.15, the variation of magnetization versus temperature in a magnetic applied field of the sample indicates that La0.5Ca0.35MnO3 is converted from a ferromagnetic phase to a paramagnetic phase. The Curie temperature (Tc) of the sample increases with the concentration of vacancy doping. The value of Tc increases from 209.5 to 242.1 K when x increases from 0 to 0.15. The Arrott plot indicates that the phase transition occurring in the sample is a secondary phase transition. When x = 0.15, the Curie temperature of the sample reaches 242.1 K; when the magnetic field variation is equal to 5 T, the maximum magnetic entropy changes (− ΔSM) of the sample become 1.77 J kg−1 K−1 and the relative cooling capacity (RCP) is 95.58 J•kg−1.

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Funding

This work was supported by the National Nature Science Foundation of China (project no. 51562006).

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Authors and Affiliations

  1. School Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guilin University of Technology, Guilin, China

    Qingqing He, Zhengguang Zou & Zheng Mao

  2. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials, Guilin University of Technology, Guilin, China

    Zhengguang Zou

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  1. Qingqing He
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  2. Zhengguang Zou
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  3. Zheng Mao
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Correspondence to Zhengguang Zou.

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He, Q., Zou, Z. & Mao, Z. Study on the Effect of Vacancy Doping on the Magnetocaloric Effect of La0.65−xCa0.35MnO3 (0 ≤ x ≤ 0.15). J Supercond Nov Magn 33, 1137–1142 (2020). https://doi.org/10.1007/s10948-019-05305-3

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  • DOI: https://doi.org/10.1007/s10948-019-05305-3

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