Formation, composition and stability of Mg–Co compounds

The existence and stability of Mg 2Co and MgCo is still a controversial issue. Even though none of these compounds are included in the last assessed Mg–Co phase diagrams, some authors have claimed their existence. In this paper we propose that only one compound with more than 40 at.% Mg exists, and...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-06, Vol.396 (1), p.182-192
Main Authors: Gennari, Fabiana C., Castro, Facundo J.
Format: Article
Language:English
Subjects:
Cobalt
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Hydrogen storage materials
Intermetallics
Magnesium alloys
Materials science
Materials synthesis
materials processing
Mechanical alloying
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
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Summary:The existence and stability of Mg 2Co and MgCo is still a controversial issue. Even though none of these compounds are included in the last assessed Mg–Co phase diagrams, some authors have claimed their existence. In this paper we propose that only one compound with more than 40 at.% Mg exists, and determine its composition, formation and stability using mainly XRD and DSC. We explore different synthesis methods: β-Mg 2CoH 5 dehydriding (prepared both by reactive mechanical alloying and by sintering), mechanical alloying of Mg and Co under Ar, mechanical alloying followed by a heat treatment, and Mg–Co solid-state reaction. We conclude that MgCo is a stable compound, whose formation process can be greatly influenced by kinetic factors that may suppress its presence in favor of MgCo 2, the only well-known stable Mg–Co compound.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.12.027