The hydriding properties of a mechanical alloy with composition Mg-25%Fe

Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg+10 wt.% Co mixture

“…Beyond 10 h, the milling has been reported to be almost ineffective (no more internal stress generated) and so no more improvement of the diffusion constant is observed. Moreover, the Co addition does not improve the diffusion process -that means that the 3d element acts as a catalyst for the dissociation of H 2 as reported elsewhere [4], [9] and [18]. The use of RMG (compared with MG) leads to the larger improvement of the diffusion process.…”

“…The usual way is the addition to Mg of some metal or alloy by the use of high-energy ball milling (mechanical alloying [3]). Over the last 20 years, a large group of heterogeneous systems has been studied such as Mg-Fe [4], Mg-Ni [5], Mg-LaNi 5 [6] and many others [7]. It has also been shown that mechanical grinding in a reactive atmosphere promotes the solid-gas reaction.…”

Thermodynamics of Metal Hydrides: Tailoring Reaction Enthalpies of Hydrogen Storage Materials

“…Bogdanovic et al (Bogdanovic et al, 2002) achieved very good reversibility and cycling stability with the hydrogen storage capacities remaining unchanged throughout 550-600 cycles at a level of 5-5.2 wt.% H 2 . The reaction enthalpy value is reported to be in between 77 kJ/(mol H 2 ) and 98 kJ/(mol H 2 ) (Bogdanovic et al, 2002), (Konstanchuk et al, 1987), (Puszkiel et al, 2008), (Didisheim et al, 1984). The large reaction enthalpies of MgH 2 and Mg 2 FeH 6 lead to weight and volume related heat storage densities in the temperature range of 500 °C which are many times higher than that of the possible sensible or latent heat storage materials (Bogdanovic et al, 2002).…”

Mechanochemical Activation of (SeO2+Na2CO3) Mixture and Sodium Selenite Synthesis in Vibrational Mill

“…A significiant number of research works have been devoted to the efforts to use such effects of mechanical activation in specific processes, with practical consequences of improved physicochemical characteristics of treated materials (7)(8)(9), mechanical alloying of metals (10)(11)(12), and mechanochemical preparation of mixed oxides, carbides, and borides (13,15). If carefully chosen input components are exposed to sufficiently intense mechanical treatment, they may partly or completely react and form new chemical compounds (16)(17)(18).…”