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The structural, magnetic, hydrogenation and electrode properties of REMg2Cu9−xNix alloys (RE=La, Pr,Tb)

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Central European Journal of Chemistry

Abstract

The LaMg2Cu9, PrMg2Cu9, LaMg2Cu4Ni5, PrMg2Cu4Ni5 and TbMg2Cu6Ni3 alloys were prepared for the investigations of crystal structure, magnetic and hydrogen storage properties. The magnetic properties of several REMg2Cu9−xNix compounds have been studied up to 9 T and from 2 to 300 K. Tb compounds show a ferrimagnetic (with Ni) or antiferromagnetic (without Ni) behaviour, which can be attributed to the Tb magnetic structure. At high temperature a paramagnetic Curie Weiss behaviour is observed and the effective moment corresponds to that of Tb. A magnetic contribution of Pr moment is observed in both Pr compounds, with larger magnetization for PrMg2Cu4Ni5 and a transition at 3 K. The hydrogen absorption occurs at 95 bar for LaMg2Cu9 (3 H f.u.−1) and above 2 bars for LaMg2Cu4Ni5 (1.6 H f.u.−1). The effect of Cu-Ni substitution on the electrochemical properties of LaMg2M9 ternary alloys was investigated leading to maximum discharge capacity of 250–310 mAh g−1.

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Authors and Affiliations

  1. Institute of Chemistry, Environment Protection and Biotechnology, Jan Dlugosz University, 42200, Czestochowa, Poland

    Volodymyr Pavlyuk, Ewa Rozycka-Sokolowska & Bernard Marciniak

  2. Institut de Chimie et des Matériaux de Paris-Est, Chimie Métallurgique des Terres Rares, CNRS and UPEC, 94320, Thiais Cedex, France

    Valerie Paul-Boncour & Maria Dorogova

Authors
  1. Volodymyr Pavlyuk
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  2. Ewa Rozycka-Sokolowska
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  3. Bernard Marciniak
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  4. Valerie Paul-Boncour
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  5. Maria Dorogova
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Correspondence to Volodymyr Pavlyuk.

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Pavlyuk, V., Rozycka-Sokolowska, E., Marciniak, B. et al. The structural, magnetic, hydrogenation and electrode properties of REMg2Cu9−xNix alloys (RE=La, Pr,Tb). cent.eur.j.chem. 9, 1133–1142 (2011). https://doi.org/10.2478/s11532-011-0099-2

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  • DOI: https://doi.org/10.2478/s11532-011-0099-2

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