MAGNETOCALORIC EFFECT OF La0.9Ce0.1Fe11.44Si1.56Hy ALLOY AND POWER BONDED BLOCK

doi:10.11900/0412.1961.2014.00473

Acta Metall Sin

2015, Vol. 51

Issue (6): 762-768 DOI: 10.11900/0412.1961.2014.00473

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MAGNETOCALORIC EFFECT OF La_0.9Ce_0.1Fe_11.44Si_1.56H_y ALLOY AND POWER BONDED BLOCK

Lijuan MU^1,^2,³,Jiaohong HUANG³(

),Cuilan LIU³,Juan CHENG³,Naikun SUN⁴,Zengqi ZHAO³

1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051
2 School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010
3 Baotou Research Institute of Rare Earth, Baotou 014030
4 School of Science, Shenyang Ligong University, Shenyang 110159

Cite this article:

Lijuan MU, Jiaohong HUANG, Cuilan LIU, Juan CHENG, Naikun SUN, Zengqi ZHAO. MAGNETOCALORIC EFFECT OF La_0.9Ce_0.1Fe_11.44Si_1.56H_y ALLOY AND POWER BONDED BLOCK. Acta Metall Sin, 2015, 51(6): 762-768.

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Abstract

Recently, La(Fe, Si)₁₃-based magnetic refrigeration materials have been widely explored due to the advantages of giant magnetocaloric effect (MCE), tunable Curie temperature (T_C), low cost of raw materials and excluding deleterious elements compared to other room-temperature giant MCE materials such as Gd₅(Ge_1-_xSi_x)₄,MnFeP_0.45As_0.55and MnAs based compounds. In this work, in order to shift the T_C to around room temperature and maintain the large MCE, the method of absorbing hydrogen was employed. La_0.9Ce_0.1Fe_11.44Si_1.56 hydride was prepared by saturated hydrogen absorption and then hydrogen contents and T_C of the hydrides were controlled by subsequent dehydrogenation at different temperatures (T_d=200~250 ℃ for 3 h). The phase structure and magnetocaloric effect were investigated. The results show that the samples possess the cubic NaZn₁₃-type structure with a small amount of a-Fe as impurity phase. T_C exhibits an approximately linear decrease with increasing the dehydrogenation temperature. The isothermal magnetic entropy change (ΔS_m) of the hydrides decreases compared with the parent compound, which is mainly attributed to the fact that the field-induced itinerant-electron metamagnetic transition has been weakened upon hydrogen absorption. For the sample desorbed hydrogen at temperatures above 230 ℃, ΔS_m is remarkably decreased and favorably the magnetic hysteresis loss has been reduced simultaneously. With further increasing the temperature to 250 ℃, ΔS_m curve is broadened, weakening the characteristic of the first-order phase transition. Due to the intrinsic brittleness of hydrides, the preparation of a certain shape is of great importance for practical application. For a magnetic field change of 1.5 T, the maximum adiabatic temperature change (ΔT_ad) and ΔS_m for the bonded block of fully hydrogen absorption La_0.9Ce_0.1Fe_11.44Si_1.56 hydride are about 2.7 K and 7.5 J/(kgK), respectively, which are larger than those of La(Fe, Co, Si)₁₃ materials in the same magnetic field change range. In conclusion, the bonded La_0.9Ce_0.1Fe_11.44Si_1.56 hydrides with good MCE and different T_C have been successfully prepared and will be very useful for the practical application of layered magnetic refrigerants at ambient temperature under low field change in magnetic refrigerators.

Key words: La_0.9Ce_0.1Fe_11.44Si_1.56H_y hydrogen absorption dehydrogenation power bond magnetocaloric effect

Received: 15 January 2015

Fund: Supported by National Natural Science Foundation of China (No.51261001) and Liaoning Provincial Natural Science Foundation (No.2013020105)

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	Lijuan MU
	Jiaohong HUANG
	Cuilan LIU
	Juan CHENG
	Naikun SUN
	Zengqi ZHAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00473 OR https://www.ams.org.cn/EN/Y2015/V51/I6/762

Fig.1 Room temperature XRD spectra for La_0.9Ce_0.1Fe_11.44Si_1.56 alloy and La_0.9Ce_0.1Fe_11.44Si_1.56H_y

Fig.2 Thermogravimetric (TG) curve of La_0.9Ce_0.1Fe_11.44Si_1.56H_y

Fig.3 Magnetization-temperature (M-T) (a) and isothermal magnetic entropy change (b) curves of La_0.9Ce_0.1Fe_11.44Si_1.56 and the hydride (m₀—permeability of vacuum, H—magnetic field intensity, M—magnetization, ΔS_m—isothermal magnetic entropy change)

Fig.4 M-T curves of La_0.9Ce_0.1Fe_11.44Si_1.56H_y after 3 h dehydrogenation at different dehydrogenation temperatures (T_d) (a) and relationship of Curie temperature T_C and T_d (b)

Fig.5 M-H curves of La_0.9Ce_0.1Fe_11.44Si_1.56H_y after 3 h dehydrogenation at 200 ℃ (a) and Arrott plots (b) under increasing and decreasing fields

Fig.6 M-H curves of La_0.9Ce_0.1Fe_11.44Si_1.56H_y after 3 h dehydrogenation at 250 ℃ (a) and Arrott plots (b) under increasing and decreasing fields

Fig.7 ΔS_m of La_0.9Ce_0.1Fe_11.44Si_1.56H_y after 3 h dehydrogenation at different temperatures

Fig.8 Temperature dependences of adiabatic temperature change (ΔT_ad) (a) and ΔS_m (b) for the bonded La_0.9Ce_0.1Fe_11.44Si_1.56H_y (The insets in Fig.8b show the bonded samples)

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