Characterization of MgH2 formation by low-energy ball-milling of Mg and Mg+C (graphite) mixtures under H2 atmosphere

The effect of high-pressure torsion on the microstructure and hydrogen absorption kinetics of ball-milled Mg70Ni30

“…To improve the hydrogen storage properties of magnesium, nanosized Mg powders have been produced by mechanical alloying [4][5][6]. Ball milling (BM) of Mg/MgH 2 up to several hours results in fine nanopowder with a typical average grain size ranging from 10 to 30 nm [7][8][9][10].…”

MgH2 synthesis during reactive mechanical alloying studied by in-situ pressure monitoring

“…Particle area for the first situation has been estimated from SEM images (Fig. 7), while grain boundary area for the second option has been calculated from grain size data estimated from XRD results [29]. In both cases, the following expression for the total surface of a sample of mass m and density r, composed of a great number of spherical particles of radius R 0 has been used.…”

Hydrogen storage of nanocrystalline Mg–Ni alloy processed by equal-channel angular pressing and cold rolling

“…Unfortunately, the high stability of the hydride phase and sluggish Mg↔MgH 2 kinetics are critical obstacles against the use of commercial MgH 2 in wide-spread practical applications. High energy ball milling (HEBM) processing technique has been applied to produce Mg powders or Mg-based composites since this method easily lead to simultaneous particle size and crystallite size reduction [4][5][6][7][8], which enhances the hydrogen sorption kinetics significantly due to the increased volumetric density of grain boundaries and lattice defects [9][10]. Milling metal or metal-oxides catalyst powders with magnesium results in a fine and homogeneous dispersion of the additives, accompanied with the thermodynamical destabilization of MgH 2 [3,8,11].…”