首页|The effect of metal/non-metal ratio on the microstructure and magnetic properties of(MnFe)x(P0.5Si0.5)microwires
The effect of metal/non-metal ratio on the microstructure and magnetic properties of(MnFe)x(P0.5Si0.5)microwires
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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 Fe2P phase increased with the reduction of x.Meanwhile,the(Mn,Fe)3Si impurity phase is formed for x=2.00-1.90 whereas change to(Mn,Fe)5Si3 structure for x=1.85.It's worth noting that a metal deficiency resulted in the thermal hysteresis(Thys)and the magnetic hysteresis loss(Wy)decreased by～40％.,The magnetic transition temperature(Ttran),peak value of isothermal magnetic entropy change(-ΔSpeak iso),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(P0.5Si0.5)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.
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