A metallographic approach to the study of MgH2-Mg phase transformation


https://doi.org/10.4081/microscopie.2008.4959
Vol. 9 No. 1 (2008)
Submitted: 15 January 2015
Accepted: 15 January 2015
Published: 31 March 2008
Hydrogen storage, Magnesium hydride, Scanning Electron Microscopy, Microstructure, Metallographic analysis, Phase Transformation.
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Authors

  • M. Vittori Antisari ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
  • A. Montone
    montone@casaccia.enea.it
    ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
  • N. Abazovic Vinca Institute of Nuclear Sciences, Laboratory of Radiation Chemistry and Physics, Belgrade, Serbia.
  • A. Aurora ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
  • M. Drvendzija Vinca Institute of Nuclear Sciences, Laboratory of Material Sciences, Belgrade, Serbia.
  • M.R. Mancini ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
  • D. Mirabile Gattia ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
  • F. Pierdominici ENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome, Italy.
An experimental protocol for the metallographic study of the phase transformation in the MgH2-Mg hydrogen storage system has been developed. To this purpose partially desorbed MgH2 powders have been examined by scanning electron microscopy, with the aim of better understanding the kinetic mechanisms involved in the thermal decomposition of MgH2 that is at the basis of H2 release. The method is based on the different secondary electron emission yield of metallic Mg and insulating MgH2 at low accelerating voltage. In optimized observation conditions, a net contrast between the two phases, even in the presence of catalyst particles constituted by heavy elements, has been obtained. First results evidence the role of catalyst particles in assisting the nucleation step in the MgH2/Mg phase transformation.

Vittori Antisari, M., Montone, A., Abazovic, N., Aurora, A., Drvendzija, M., Mancini, M., Mirabile Gattia, D., & Pierdominici, F. (2008). A metallographic approach to the study of MgH<sub>2</sub>-Mg phase transformation. Microscopie, 9(1), 53–57. https://doi.org/10.4081/microscopie.2008.4959

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