Мақола

A metallographic approach to the study of MgH 2 -Mg phase transformation

M. Vittori AntisariENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, RomeAmelia MontoneENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, RomeNadica D. AbazovićVinca Institute of Nuclear Sciences, Laboratory of Radiation Chemistry and Physics, BelgradeAnnalisa AuroraENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, RomeMilica DrvendzijaVinca Institute of Nuclear Sciences, Laboratory of Material Sciences, BelgradeM.R. ManciniENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, RomeDaniele Mirabile GattiaENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, RomeF. PierdominiciENEA, Department of Physical Methods and Materials, Research Centre of Casaccia, Rome

2008en

ABI

Аннотация

An experimental protocol for the metallographic study of the phase transformation in the MgH 2 -Mg hydrogen storage system has been developed. To this purpose partially desorbed MgH 2 powders have been examined by scanning electron microscopy, with the aim of better understanding the kinetic mechanisms involved in the thermal decomposition of MgH 2 that is at the basis of H 2 release. The method is based on the different secondary electron emission yield of metallic Mg and insulating MgH 2 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 MgH 2 /Mg phase transformation.

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Мавзулар

Hydrogen Storage and Materials Superconductivity in MgB2 and Alloys Spacecraft and Cryogenic Technologies

Идентификаторлар

DOI: 10.4081/microscopie.2008.4959

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