Nanocrystalline and non-crystalline hydrides synthesized by controlled reactive mechanical alloying/milling of Mg and Mg–X (X = Fe, Co, Mn, B) systems

Particle size effects on the desorption properties of nanostructured magnesium dihydride (MgH2) synthesized by controlled reactive mechanical milling (CRMM)

“…Therefore, a very fundamental question arises as to what factor is a primary factor responsible for the improved hydrogen storage properties: the size of nanograin or the mean size of hydride particle? Our recent research results show some unexpected trend, namely that the nanograin size of hydride does not seem to affect the hydrogen desorption temperature as measured by differential scanning calorimetry (DSC) technique [2][3][4]. These new findings prompted us to pursue a systematic research program the objective of which is to find out if there is a relationship between the hydride particle size, nanograin size and hydrogen desorption characteristics as measured by differential scanning calorimetry.…”

In situ synchrotron X-ray diffraction studies of hydrogen desorption and absorption properties of Mg and Mg–Mm–Ni after reactive ball milling in hydrogen

“…This took place, for example, with MgH 2 ball-milled in Ar [3] and with MgH 2 prepared by RBM and studied in a differential scanning calorimetry experiment (6°C min À1 ) in a flow of Ar gas [25]. The first, low temperature desorption peak was attributed to the complete decomposition of c-hydride; the second peak was assigned to the decomposition of the a-hydride only.…”

Investigation of Effect of Milling Atmosphere and Starting Composition on Mg2FeH6 Formation

“…The synthesis of Mg 2 FeH 6 by ball milling has been studied by several authors using different milling parameters, such as: type of mill; ball to powder ratio; number and size of balls; milling time; rotational speed; milling atmosphere and hydrogen pressure [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Irrespective of the milling conditions, some iron was always detected in the milled powder representing an incomplete Mg 2 FeH 6 formation.…”