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

LORENA BAUM; MARCOS MEYER; LUIS MENDOZA ZELIS

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2007 vol. 33 p. 3442 - 3446

0360-3199

Ternary Mg2THy, as well as quaternary Mg2T0:5T00:5Hy, Mg-based hydrides with T; T = Fe; Co; Ni were synthesized by reactive mechanical alloying in hydrogen atmosphere at 0.3MPa. The reaction progress was followed from the H2 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 Mg2T intermetallicprecursors 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 Mo¨ ssbauer spectroscopy