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 MnO 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 meanfield model.The T_(C)declines with C_(o) doping and reaches near room temperature(302 K)at x=0.075.The maximum magnetic entropy change(-ΔS_(M)^(max))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.
作者
Changji Xu
Xinyu Jiang
Zhengguang Zou
Zhuojia Xie
Weijian Zhang
Min Feng
徐长吉;姜心雨;邹正光;谢卓家;张伟建;冯敏(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)
基金
Project supported by the National Natural Science Foundation of China(Grant No.52162038)。
