Influence of Hydrogen Absorption and Desorption on Magnetocaloric Effect of La0.6Pr0.4Fe11.4Si1.6B0.2 Alloy

doi:10.11901/1005.3093.2015.004

Chinese Journal of Materials Research

2015, Vol. 29

Issue (11): 829-834 DOI: 10.11901/1005.3093.2015.004

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Influence of Hydrogen Absorption and Desorption on Magnetocaloric Effect of La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 Alloy

Tao ZHANG^1,^2,^3,^**(

),Cuilan LIU²,Yong ZHANG³

1. Inner Mongolia Baotou Steel Rare-earth (Group) Hi-tech Co., Ltd. Baotou 014030, China
2. Baotou Research Institute of Rare Earth, Inner Mongolia, Baotou 014030, China
3. State Key Laboratory for Advanced Metals and Materials, University of Science and
Technology Beijing, Beijing 100083, China

Cite this article:

Tao ZHANG,Cuilan LIU,Yong ZHANG. Influence of Hydrogen Absorption and Desorption on Magnetocaloric Effect of La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 Alloy. Chinese Journal of Materials Research, 2015, 29(11): 829-834.

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Abstract

The La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 alloy was produced by using industrial grade raw materials. The phase constituents and thermal magnetic properties of the alloy were characterized by X-ray diffraction with Cu kα radiation and vibration sample magnetism respectively. The influence of hydrogen absorption pressure on magnetocaloric effect and hydrogen desorption process were investigated. Results show that the annealing treated alloy was subjected to hydrogenation at 0.13 and 0.2 MPa, correspondingly its Curie temperature increased to 320 and 321 K respectively. The taking place of dehydrogenation was much easier for the alloy hydrogenated at lower absorption pressure rather than that at higher pressure. The Curie temperature of the alloy hydrogenated at 0.13 MPa and then dehydrogenated at 473K could lower to room temperature range, correpondingly the maximal magnetic entropy of the hydrides decreased while the relative cooling power were increased.

Key words: metallic materials magnetic materials magnetocaloric properties hydrogen desorption stability Curie temperature

Received: 05 January 2015

Fund: *Supported by National High Technology Research and Development Program of China No. 2011AA03A404, Inner Mongolia Baotou Steel Rare-Earth (Group) Hi-Tech Co., Ltd. Postdoctoral Workstation Funded Project and Inner Mongolia Natural Science Foundation of China No.2013MS0802.

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.004 OR https://www.cjmr.org/EN/Y2015/V29/I11/829

Fig.1 XRD patterns (a), M-T (b) and △S_M-T (insert drawing (c)) of alloys annealed at 1473 K for 16 and 30 h

Fig.2 M-T curves of sample annealed at 1473 K for 30 h and hydrides hydrogenated at 0.13 and 0.2 MPa for 5 h

Fig.3 M-B curves of alloys annealed at 1473 K for 30 h (a), hydrogenated for 5 h at 0.2 MPa (b) and 0.13 MPa (c) along with their △S_M-T curves (d)

Fig.4 Relation between T_C and HD times for hydrides samples obtained at 0.13 and 0.2 MPa hydrogen pressures

Fig.5 Hydrogenation desorption M-B curves of samples dehydriding at 473 K then hydrogenating and dehydrogenating by HA at 0.2 MPa for 180 min (a), by HA at 0.2 MPa for 75 min (b) and by HA at 0.13 MPa for 105 min (c) and their △S_M-T curves (d)

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