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Studies of mixed hydrides based on Mg and Ca by reactive ball milling

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
476
Identifiers
DOI: 10.1016/j.jallcom.2008.09.112
Keywords
  • Hydrogen Storage Materials
  • Reactive Milling
  • Alanates

Abstract

Abstract Combinations of alkali, alkaline earth hydrides and alanates or aluminium were ball milled under high hydrogen pressures (100 bar). Powder X-ray diffraction, volumetric measurements and dynamic high-pressure differential scanning calorimetry (HP-DSC) were used in order to explore reaction mechanisms, formation of new phases and provide answers to the question of reversibility. Ball milling parameters, in particular the milling speed, were found to be important for the reaction paths. Among the studied systems, the formation of new unidentified peaks, however with lack in reversibility, has been found in the mixtures Mg–Al–Ca–H, Ca–Al–Li–H and Ca–Al–Na–H.

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