首页|Tuning the magnetocaloric and structural properties of La0.67Sr0.28Pr0.05Mn1-xCOxO3 refrigeration materials

Tuning the magnetocaloric and structural properties of La0.67Sr0.28Pr0.05Mn1-xCOxO3 refrigeration materials

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Tuning the magnetocaloric and structural properties of La0.67Sr0.28Pr0.05Mn1-xCOxO3 refrigeration materials
The structural,magnetic and magnetocaloric properties of perovskite manganites La0.67Sr0.28Pr0.05Mn1-xCoxO3(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(TC),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 Tc declines with Co doping and reaches near room temperature(302 K)at x=0.075.The maximum magnetic entropy change(-ΔSMmax)at x=0.05 is 4.27 J/kg·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.

magnetic refrigerationperovskite manganitessecond-order phase transitionsrelative cooling powermagnetocaloric effect

徐长吉、姜心雨、邹正光、谢卓家、张伟建、冯敏

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

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

magnetic refrigeration perovskite manganites second-order phase transitions relative cooling power magnetocaloric effect

2024

10.1088/1674-1056/ad8550

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(12)