Large Magnetocaloric Effect of Sm3+-Doped La0.7Sr0.3-xSmxMn0.95Ni 0.05O3(x=0, 0.05, 0.10, 0.15) Manganites Near Room Temperature

作者：Jiang, Xinyu; Zou, Zhengguang^*; He, Bangrong; Zhang, Weijian; Mao, Zheng

来源：Journal of Electronic Materials, 2023, 52(7): 4587-4602.

DOI：10.1007/s11664-023-10395-w

• Sm3+ doping
• Curie temperature
• MCE
• manganites

A La0.7Sr0.3-xSmxMn0.95Ni0.05O3 (x = 0, 0.05, 0.10, 0.15) series of manganites were synthesized by the Pechini sol-gel method. The changes in structure and magnetic properties caused by the substitution of Sr2+ by Sm3+ were systematically investigated. The results of Rietveld refinement using GSAS (General Structure Analysis System) software showed that the samples had a rhombohedral structure before and after the substitution, but the cell volume increased. In addition, the Curie temperature (T-C) of the samples gradually decreased with increased doping, and the magnetic entropy change (Delta S-M) showed the same trend. This can be attributed to the weakening of the ferromagnetic coupling between Mn4+ and Mn3+. For the doped sample with x = 0.05, the T-C was 300 K, and the maximum magnetic entropy change ( -Delta S-M(max) ) reached 4.59 J kg(-1) K-1 at an applied magnetic field of 5 T. The relative cooling power (RCP) also reached 297.39 J kg(-1), which is certainly promising for meeting the need for room-temperature magnetic refrigeration. @@@ [GRAPHICS] @@@ .

• 单位
  桂林理工大学