Complex Mg-based hydrides obtained by mechanosynthesis: Characterization and formation kinetics

Ternary Mg 2 TH y , as well as quaternary Mg 2 T 0.5 T 0.5 ′ H y , Mg-based hydrides with T , T ′ = Fe , Co , Ni were synthesized by reactive mechanical alloying in hydrogen atmosphere at 0.3 MPa. The reaction progress was followed from the H 2 absorption during milling until a steady state was reac...

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Bibliographic Details
Published in:International journal of hydrogen energy 2008-07, Vol.33 (13), p.3442-3446
Main Authors: Baum, Lorena A., Meyer, Marcos, Mendoza-Zélis, Luis
Format: Article
Language:English
Subjects:
Complex hydrides
Hydrogen storage
Mechanosynthesis
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Summary:Ternary Mg 2 TH y , as well as quaternary Mg 2 T 0.5 T 0.5 ′ H y , Mg-based hydrides with T , T ′ = Fe , Co , Ni were synthesized by reactive mechanical alloying in hydrogen atmosphere at 0.3 MPa. The reaction progress was followed from the H 2 absorption during milling until a steady state was reached, and different kinetic behaviors were found in each case. These regimes could be related to the presence or absence of hydrogen-free Mg 2 T intermetallic precursors in the respective phase diagrams. The steady state samples were characterized by X-ray diffraction and differential scanning calorimetry, and those systems including Fe were studied, in addition, with Mössbauer spectroscopy.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2007.10.045