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Structural, magnetic and magnetocaloric effect investigation of La0.8-xGdxSr0.2MnO3(x = 0.00, 0.05, 0.075, 0.10) manganites near room temperature

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

The La0.8-xGdxSr0.2MnO3 (x = 0.00,0.05,0.075,0.10) manganites were synthesized by the Pechini sol-gel method. The effects of doping Gd3+ on the structure, morphology and magnetic and magnetocaloric properties were investigated. The GSAS refinement showed that the Mn-O bond length and Mn-O-Mn bond angle changed, with the increase of Gd3+ replacement, shifting the TC near room temperature. The samples exhibited second-order phase transition near TC. The maximum magnetic entropy change ΔSM of the samples were 4.06 J kg−1K−1, 4.26 J kg−1K−1, 4.23 J kg−1K−1, and 3.59 J kg−1K−1 at an applied magnetic field of 5 T. The TC of the samples was 295 K at a doping level of 0.075, which was very close to room temperature. The relative cooling power RCP of La0.725Gd0.075Sr0.2MnO3 was 116.40 J kg−1 at an applied magnetic field of 2 T. All evidence indicated that La0.725Gd0.075Sr0.2MnO3 was potentially promising for magnetic applications.

Graphical Abstract

Highlights

  • The La0.8-xGdxSr0.2MnO3 manganites were synthesized by the Pechini sol–gel method.

  • As the TC close to room temperature, the ΔSM always remains at a stable value.

  • TC of La0.725Gd0.075Sr0.2MnO3 was 295 K and RCP is 116.40 J•kg−1 at an applied magnetic field of 2 T.

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Data availability

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

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 52162038), the Guangxi Distinguished Experts Special Fund (No. 2019B06).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Guilin University of Technology, 541004, Guilin, China

    Bangrong He, Zhengguang Zou, Weijian Zhang, Xinyu Jiang & Zheng Mao

  2. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials, Guilin University of Technology, 541004, Guilin, China

    Zhengguang Zou

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  1. Bangrong He
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BH: Data collecting, Writing Original draft preparation. WZ: Visualization, Investigation. XJ: Supervision. ZM: Supervision.

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Correspondence to Zhengguang Zou.

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He, B., Zou, Z., Zhang, W. et al. Structural, magnetic and magnetocaloric effect investigation of La0.8-xGdxSr0.2MnO3(x = 0.00, 0.05, 0.075, 0.10) manganites near room temperature. J Sol-Gel Sci Technol 106, 790–803 (2023). https://doi.org/10.1007/s10971-023-06095-w

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