The effect of metal/non-metal ratio on the microstructure and magnetic properties of (MnFe)x(P0.5Si0.5) microwires  

作　　者：Lin Luo Hongxian Shen Lunyong Zhang Zhiliang Ning Jianfei Sun Manh-Huong Phan 

机构地区：[1]National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin,150001,China [2]Department of Physics,University of South Florida,Tampa,FL,33620,USA

出　　处：《Progress in Natural Science:Materials International》2024年第5期1085-1092,共8页自然科学进展·国际材料(英文版)

基　　金：financially supported by the National Natural Science Foundation of China (No. 51827801);support from the University of South Florida under Grant No. 125300

摘　　要：The effects of metal/non-metal ratio(M/NM=x:1)on the microstructure and magnetocaloric properties of promising melt-extracted Mn–Fe–P–Si microwires with short heat treatment have been investigated here.More Fe2P principal phase,which is considered favorite for magnetocaloric effect(MCE),should achieve at low M/NM ratio and the fraction of Fe_(2)P phase increased with the reduction of x.Meanwhile,the(Mn,Fe)_(3)Si impurity phase is formed for x=2.00–1.90 whereas change to(Mn,Fe)_(5)Si_(3)structure for x=1.85.It's worth noting that a metal deficiency resulted in the thermal hysteresis(T_(hys))and the magnetic hysteresis loss(W_(y))decreased by~40%.,The magnetic transition temperature(T_(tran)),peak value of isothermal magnetic entropy change(-Δ_(iso)^(Speak)),refrigerant capacity(RC)and effective refrigerant capacity(RCE)first increased then decreased with the decrease of x,and reached the maximums at x=1.90,i.e.,370 K,26.0 J kg^(-1)K^(-1),367.4 and 339.8 J kg^(-1),respectively.Therefore,the customizable microstructure and magnetic properties of the melt-extracted(MnFe)_(x)(P_(0.5)Si_(0.5))microwires will be achievable effectively by tuning M/NM ratio x,and optimized Mn–Fe–P–Si compounds with novel thermomagnetic properties will be obtained.

关 键 词：Mn-Fe-P-Si MICROWIRES Melt-extraction M/NM ratio Magnetocaloric properties 

分 类 号：TB64[一般工业技术—制冷工程]