中国物理B ›› 2024, Vol. 33 ›› Issue (12): 127501-127501.doi: 10.1088/1674-1056/ad8550

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Tuning the magnetocaloric and structural properties of La0.67Sr0.28Pr0.05Mn1-xCoxO3 refrigeration materials

Changji Xu(徐长吉)1, Xinyu Jiang(姜心雨)1, Zhengguang Zou(邹正光)1,2,†, Zhuojia Xie(谢卓家)1, Weijian Zhang(张伟建)1, and Min Feng(冯敏)1   

  1. 1 College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;
    2 Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials, Guilin University of Technology, Guilin 541004, China
  • 收稿日期:2024-06-21 修回日期:2024-09-10 接受日期:2024-10-10 发布日期:2024-11-12
  • 通讯作者: Zhengguang Zou E-mail:zouzgglut@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 52162038).

Tuning the magnetocaloric and structural properties of La0.67Sr0.28Pr0.05Mn1-xCoxO3 refrigeration materials

Changji Xu(徐长吉)1, Xinyu Jiang(姜心雨)1, Zhengguang Zou(邹正光)1,2,†, Zhuojia Xie(谢卓家)1, Weijian Zhang(张伟建)1, and Min Feng(冯敏)1   

  1. 1 College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;
    2 Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials, Guilin University of Technology, Guilin 541004, China
  • Received:2024-06-21 Revised:2024-09-10 Accepted:2024-10-10 Published:2024-11-12
  • Contact: Zhengguang Zou E-mail:zouzgglut@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 52162038).

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摘要： The structural, magnetic and magnetocaloric properties of perovskite manganites La$_{0.67}$Sr$_{0.28}$Pr$_{0.05}$Mn$_{1-x}$Co$_{x}$O$_{3}$ ($x = 0.05$, 0.075 and 0.10) (LSPMCO) are investigated. LSPMCO crystallizes as a rhombohedral structure with $R$-$3c$ space group. As the Co content increases, the cell volume expands, the Mn-O-Mn bond angle reduces and the length of the Mn-O bond increases. The samples show irregular submicron particles under a Zeiss scanning electron microscopy. The particle size becomes larger with increasing doping. The chemical composition of the samples is confirmed by x-ray photoelectron spectroscopy (XPS). The ferromagnetic (FM) to paramagnetic (PM) phase transition occurs near the Curie temperature ($T_{\rm C}$), and all transitions are second-order phase transitions (SMOPT) characterized by minimal thermal and magnetic hystereses. Critical behavior analysis indicates that the critical parameters of LSPMCO closely align with those predicted by the mean-field model. The $T_{\rm C}$ declines with Co doping and reaches near room temperature (302 K) at $x = 0.075$. The maximum magnetic entropy change ($-\Delta S_{\rm M}^{\max}$) at $x = 0.05$ is 4.27 J/kg$\cdot$K, and the relative cooling power (RCP) peaks at 310.81 J/K. Therefore, the system holds significant potential for development as a magnetic refrigeration material, meriting further professional and objective evaluation.

关键词: magnetic refrigeration, perovskite manganites, second-order phase transitions, relative cooling power, magnetocaloric effect

Abstract: The structural, magnetic and magnetocaloric properties of perovskite manganites La$_{0.67}$Sr$_{0.28}$Pr$_{0.05}$Mn$_{1-x}$Co$_{x}$O$_{3}$ ($x = 0.05$, 0.075 and 0.10) (LSPMCO) are investigated. LSPMCO crystallizes as a rhombohedral structure with $R$-$3c$ space group. As the Co content increases, the cell volume expands, the Mn-O-Mn bond angle reduces and the length of the Mn-O bond increases. The samples show irregular submicron particles under a Zeiss scanning electron microscopy. The particle size becomes larger with increasing doping. The chemical composition of the samples is confirmed by x-ray photoelectron spectroscopy (XPS). The ferromagnetic (FM) to paramagnetic (PM) phase transition occurs near the Curie temperature ($T_{\rm C}$), and all transitions are second-order phase transitions (SMOPT) characterized by minimal thermal and magnetic hystereses. Critical behavior analysis indicates that the critical parameters of LSPMCO closely align with those predicted by the mean-field model. The $T_{\rm C}$ declines with Co doping and reaches near room temperature (302 K) at $x = 0.075$. The maximum magnetic entropy change ($-\Delta S_{\rm M}^{\max}$) at $x = 0.05$ is 4.27 J/kg$\cdot$K, and the relative cooling power (RCP) peaks at 310.81 J/K. Therefore, the system holds significant potential for development as a magnetic refrigeration material, meriting further professional and objective evaluation.

Key words: magnetic refrigeration, perovskite manganites, second-order phase transitions, relative cooling power, magnetocaloric effect

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.30.-m (Intrinsic properties of magnetically ordered materials) 75.47.Lx (Magnetic oxides) 75.10.-b (General theory and models of magnetic ordering)