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Rare Metals

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26.02.2018

Flow hydrogen absorption of LaFe_10.9Co_0.8Si_1.3 compound under constant low hydrogen gas pressure

verfasst von: Bin Fu, Jun He, Jie Han, Jie Hu, Li-Wei Pang

Erschienen in: Rare Metals | Ausgabe 3/2018

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Abstract

The hydrogen absorption of the LaFe_10.9Co_0.8Si_1.3 compound under constant 1.01 × 10⁵ Pa H₂ gas in a flow hydrogen atmosphere was studied. The effects of hydrogen absorption on structure, Curie temperature, phase transition and magnetic property were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and superconducting quantum interference device, respectively. The hydrides of LaFe_10.9Co_0.8Si_1.3 crystallize into NaZn₁₃-type structural phase after hydrogen absorption at temperature from 548 to 623 K. Lower hydrogen absorption temperature is of no advantage for pure 1:13 phase formation in a flow H₂ atmosphere. The Curie temperature (T_C) of LaFe_10.9Co_0.8Si_1.3 compound increases by 70 K or more after hydrogen absorption. For LaFe_10.9Co_0.8Si_1.3H_1.8 compound, the maximum magnetic entropy change and the relative cooling power under a magnetic field change of 0–2 T are 6.1 J·kg⁻¹·K⁻¹ and 170 J·kg⁻¹, respectively. Large refrigerant capacity, low hysteresis loss and wide temperature span of magnetic entropy change peak make it a competitive practical candidate for magnetic refrigerant.

Vorheriger Artikel Achievement of high performance of sintered R–Fe–B magnets based on misch metal doped with PrNd nanoparticles

Nächster Artikel Structure and electrochemical properties of LaMgNi4−x Co x (x = 0–0.8) hydrogen storage electrode alloys

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Titel: Flow hydrogen absorption of LaFe10.9Co0.8Si1.3 compound under constant low hydrogen gas pressure
verfasst von: Bin Fu
Jun He
Jie Han
Jie Hu
Li-Wei Pang
Publikationsdatum: 26.02.2018
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 3/2018
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-018-1003-4

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