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

• Authors: Volodymyr Pavlyuk , Ewa Rozycka-Sokolowska , Bernard Marciniak , Valerie Paul-Boncour , Maria Dorogova
• Languages of publication: EN

Abstracts

EN

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. [...]

Keywords

EN

Intermetallic phases; Crystal structure; Magnetic properties; Hydrogenation; Electrochemical properties

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 6
• Pages: 1133-1142

Dates

published

1 - 12 - 2011

online

27 - 9 - 2011

Contributors

author

Volodymyr Pavlyuk

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

author

Ewa Rozycka-Sokolowska

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

author

Bernard Marciniak

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

author

Valerie Paul-Boncour

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

author

Maria Dorogova

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

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Identifiers

DOI

10.2478/s11532-011-0099-2