RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn1.2Fe0.8P0.74Ge0.26-xSex COMPOUNDS

doi:10.11900/0412.1961.2014.00059

Acta Metall Sin

2014, Vol. 50

Issue (9): 1109-1114 DOI: 10.11900/0412.1961.2014.00059

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RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x COMPOUNDS

WANG Shaobo¹, LIU Danmin¹(

), XIAO Weiqiang¹, ZHANG Zhenlu¹, YUE Ming², ZHANG Jiuxing²

1 Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124
2 College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Cite this article:

WANG Shaobo, LIU Danmin, XIAO Weiqiang, ZHANG Zhenlu, YUE Ming, ZHANG Jiuxing. RESEARCH OF THE MAGNETOCALORIC PROPER- TIES IN Mn_1.2Fe_0.8P_0.74Ge_0.26-_xSe_x COMPOUNDS. Acta Metall Sin, 2014, 50(9): 1109-1114.

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Abstract

Magnetic refrigeration based on the magnetocaloric effect offers a potential energy saving, atmosphere friendly way to replace vapor-compression refrigeration. In this work, Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.005, 0.01, 0.015, 0.02, 0.03) compounds were prepared by mechanical milling and subsequent spark plasma sintering (SPS) technique, their crystal structures, phase transition process and magnetocaloric properties were investigated by XRD, DSC, VSM and direct measurement equipment of magnetocaloric effect. The results show that the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds possess a hexagonal Fe₂P-type crystal structure. With increasing Se concentration, the lattice parameters a and c change significantly. It causes c/a ratio decreases firstly, keeps unchanging and followed by increasing again. And the Curie temperature (T_c) of the compounds is increased with the decrease of the c/a ratio. Either applied magnetic field or temperature change can induce the magnetic transformation between the paramagnetic phase and ferromagnetic phase. Low substitution of Se for Ge (x≤0.015) in the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds leads to higher T_c, narrower temperature range of the two-phase coexistence (?T_coex) and larger adiabatic temperature change (?T_ad), in addition the thermal hysteresis (?T_hys) and entropy change (?S_DSC) remain almost unaffected. 0.01 Se substitution leads to 5.6 K increase in T_c, 10.6% decrease in ?T_coex, and 10% increase in ?T_ad. With a further increase in Se content, magnetocaloric properties of compound decrease.

Key words: MnFePGeSe magnetocaloric effect magnetic phase transition

ZTFLH:

TM271

Fund: Supported by National Natural Science Foundation of China (Nos.51071007 and 51171003) and Key Research Project of Beijing Municipal Commission of Education (No.KZ201410005005)

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	Shaobo WANG
	Danmin LIU
	Weiqiang XIAO
	Zhenlu ZHANG
	Ming YUE
	Jiuxing ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00059 OR https://www.ams.org.cn/EN/Y2014/V50/I9/1109

Fig.1 XRD spectra of Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds

Table 1 Lattice parameters a and c at 333 K and the magnetocaloric properties of the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds

Fig.2 DSC curves (a) and the temperatures (T) dependence of the entropy changes (∆S_DSC) (b) of the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds

Fig.3 Volume fraction of the paramagnetic phase during the paramagnetic (PM) to ferromagnetic (FM) transition for the Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.01) compounds under the cooling process

Fig.4 Isothermal magnetization curves (increasing magnetic field mode) for Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x compounds with x=0 (a) and x=0.01 (b) measured in external magnetic field change of 0~3 T (M—magnetization, H—external magnetic field, ∆T—temperature step)

Fig.5 Temperatures dependence of the magnetic entropy changes (∆S_M) of Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.01) compounds measured in a magnetic field changed from 0 to 1, 2 and 3 T

Fig.6 Temperatures dependence of adiabatic temperature changes (∆T_ad) of Mn_1.2Fe_0.8P_0.74Ge_0.26_-_xSe_x (x=0, 0.01) compounds with a field change of 0~1.5 T

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