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Experimental Study of Structural and Magnetic Properties of LaNi5 and MmNi4.7Al0.3 Hydrogen Storage Alloys

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Abstract

This study deals with an experimental investigation of structural and magnetic properties of LaNi5 and MmNi4.7Al0.3 (Mm consists of 66.6 wt% Ce and 33.3 wt% La) hydrogen storage alloys. LaNi5 and MmNi4.7Al0.3 alloys were prepared by vacuum induction melting method and then hydrogenated under 50 bar hydrogen gas pressure. The structure of the samples, before and after hydrogenation, was probed by X-ray diffraction (XRD) analysis which showed that all the samples have a single phase hexagonal crystal structure (CaCu5-type). Then X-ray fluorescence (XRF) measurement was used to investigate the chemical compound of the as-prepared samples. The study of the magnetic properties of samples indicated that the as-prepared alloys are weakly ferromagnetic or paramagnetic, while the hydrogenation process causes ferromagnetic behavior of samples to intensify. Honda-Arrott plot analysis exhibited that substitution of Al for Ni and Ce for La in the as-prepared samples reduces the magnetic susceptibility from 4.8 × 10−6 to 3.06 × 10−6 emu/gOe. Magnetic anisotropy of the hydrogenated samples in a high magnetic field was studied using the law of approach to saturation. The results indicated that the magnetic anisotropy and anisotropy field increase by the replacement of Ni and La with Al and Ce respectively.

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  1. Faculty of Basic Sciences, University of Shahreza, Shahreza, 86149-56841, Iran

    Mehdi Afshari Abolkarlou & Mohammad Hossein Amerioun

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  1. Mehdi Afshari Abolkarlou
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  2. Mohammad Hossein Amerioun
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Correspondence to Mehdi Afshari Abolkarlou.

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Abolkarlou, M.A., Amerioun, M.H. Experimental Study of Structural and Magnetic Properties of LaNi5 and MmNi4.7Al0.3 Hydrogen Storage Alloys. J Supercond Nov Magn 32, 1853–1857 (2019). https://doi.org/10.1007/s10948-019-5122-4

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  • DOI: https://doi.org/10.1007/s10948-019-5122-4

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