Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy

doi:10.11900/0412.1961.2016.00124

Acta Metall Sin

2017, Vol. 53

Issue (1): 77-82 DOI: 10.11900/0412.1961.2016.00124

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Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy

Yaoxiang GENG¹(

),Ojied TEGUS²,Haibin WANG¹,Chuang DONG³,Yuxin WANG¹

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China
3 Key Lab of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China

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Yaoxiang GENG,Ojied TEGUS,Haibin WANG,Chuang DONG,Yuxin WANG. Effect of Sn Addition on Microstructure and Magnetism of MnFe(P, Si) Alloy. Acta Metall Sin, 2017, 53(1): 77-82.

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Abstract

This decade has brought an immense interest in room temperature magnetic refrigeration, because it is considered as a type of potential energy saving material and friendly to environment. MnFe(P, Si) magnetic refrigerants materials shows high-performance and relatively low-cost, which paves the effective way for commercialization of magnetic refrigeration and magnetocaloric power-conversion. The present work is devoted to investigating the effect of Sn addition on microstructure, magnetism and magnetocaloric effect on MnFe(P, Si) alloy. Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x (x=0, 0.02, 0.04, atomic fraction) alloys were prepared by mechanical alloying (MA) and solid-state reaction methods. The results show that Sn atoms do not enter into the lattice position of Fe₂P. The Sn₂(Mn, Fe), (Fe, Mn)₃Si, Si-riche (Fe, Mn)₂(P, Si) and P-riche (Fe, Mn)₂(P, Si) matrix phase are formed in Sn-containing alloys. Two different compositions of (Fe, Mn)₂(P, Si) phase result in two ferromagnetic-paramagnetic phase transition and two magnetic entropy change (-ΔS_m) peaks at the heating process. This result is in favor of expanding the working temperature and refrigerant capacity (RC) of magnetic refrigeration materials. Mn_1.3Fe_0.7P_0.5Si_0.5 alloy shows a maximal magnetic-entropy changes (-ΔS_max) of 12.1 J/(kgK) in a magnetic field change of 0~1.5 T, a maximal adiabatic temperature change (ΔT_ad) of 2.4 K in a magnetic field change of 0~1.48 T and a thermal hysteresis (ΔT_hys) of 3 K in vicinity of Curie temperature of 273 K, which can be used as a promising candidate material for room-temperature magnetic refrigeration applications.

Key words: Mn1.3Fe0.7P0.5Si0.5-xSnx alloy, microstructure, room temperature magnetic refrigeration, magnetocaloric effect, thermal hysteresis

Received: 08 April 2016

Fund: Supported by National Magnetic Confined Fusion Energy Development (Nos.2013GB107003 and 2015GB105003), National Natural Science Foundation of China (Nos.51671045 and 51601073), Fundamental Research Funds for the Central Universities (No.DUT16ZD209) and Fund of the State Key Laboratory of Solidification Processing in NWPU (No.SKLSP201607)

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	Yaoxiang GENG
	Ojied TEGUS
	Haibin WANG
	Chuang DONG
	Yuxin WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00124 OR https://www.ams.org.cn/EN/Y2017/V53/I1/77

Fig.1 XRD spectra of Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x (x=0, 0.02, 0.04, atomic fraction) powder alloys

Fig.2 SEM images of Mn_1.3Fe_0.7P_0.5Si_0.5 (a) and Mn_1.3Fe_0.7P_0.5Si_0.46Sn_0.04 (b) alloys

Fig.3 Temperature (T) dependences of magnetization (M) (a) and dM/dT (b) curves of Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x alloys in applied field of 0.05 T (Curves a and b in Fig.3a corresponding to heating process and cooling process, respectively, T_c1—first magnetic-phase transition temperature, T_c2—second magnetic-phase transition temperature)

Fig.4 Isothermal magnetizations (M-B) of Mn_1.3Fe_0.7P_0.5Si_0.5 (a) and Mn_1.3Fe_0.7P_0.5Si_0.46Sn_0.04 (b) alloys (B—magnetic field, ΔT—temperature interval between adjacent two M-B curves)

Fig.5 Isothermal magnetic-entropy changes (-ΔS_m) curves of Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x alloys in a field change of 1.5 T (a) and adiabatic temperature change (ΔT_ad) curve of Mn_1.3Fe_0.7P_0.5Si_0.5 alloy in a field change of 1.48 T (b)

Table 1 T_c1, T_c2, thermal hysteresis of matrix phase (ΔT_hys), maximal magnetic-entropy changes of Si-rich (Fe, Mn)₂(P, Si) phase (-ΔS_max1) and matrix phase (-ΔS_max2), refrigerant capacity (RC) and maximal adiabatic temperature change (ΔTadmax) of Mn_1.3Fe_0.7P_0.5Si_0.5-_xSn_x serial alloys

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