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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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
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