Metallographic and numerical characterization of MgH2-Mg system

Annalisa Aurora, Massimo Celino, Fabrizio Cleri, Daniele Mirabile Gattia, Simone Giusepponi, Amelia Montone, Marco Vittori Antisari

Research output: Contribution to conferencePaper

Abstract

The remarkable ability of magnesium to store significant quantities of hydrogen has fostered intense research efforts in the last years in view of its future applications where light and safe hydrogen-storage media are needed. Magnesium material, characterized by light weight and low cost of production, can reversibly store about 7.7 wt% hydrogen. However, further research is needed since Mg has a high operation temperature and slow absorption kinetics that prevent the use in practical applications. For these reasons a detailed study of the interface between Mg and MgH2 is needed. Further insights are gained by characterizing the Mg-MgH2 system from both the experimental and the numerical point of view. The study of the MgH 2-Mg phase transformation in powder samples has been performed to gain detailed metallographic information. A method for studying this phase transformation by cross sectional samples scanning electron microscopy observation of partially transformed material has been developed. This method exploits the peculiar features of this system where the MgH2 phase is insulating and the Mg is a metallic conducting phase. This difference can induce a contrast between the two phases owing to the different secondary emission yield. Further insights are gained by characterizing Mg-MgH2 interfaces by means of accurate first-principle molecular dynamics simulations based on the density-functional theory. Extensive electronic structure calculations are used to characterize the equilibrium properties and the behavior of the surfaces in terms of total energy considerations and atomic diffusion. © 2009 Materials Research Society.
Original languageEnglish
Publication statusPublished - 2008
Event2008 MRS Fall Meeting - , United States
Duration: 1 Jan 2008 → …

Conference

Conference2008 MRS Fall Meeting
CountryUnited States
Period1/1/08 → …

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Aurora, A., Celino, M., Cleri, F., Gattia, D. M., Giusepponi, S., Montone, A., & Antisari, M. V. (2008). Metallographic and numerical characterization of MgH2-Mg system. Paper presented at 2008 MRS Fall Meeting, United States.