Effect of the Partial Replacement of CaH2 with CaF2 in the Mixed System CaH2 + MgB2

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Abstract

In this work the effect of a partial replacement of CaH2 with CaF2 on the sorption properties of the system CaH2 + MgB2 has been studied. The first five hydrogen absorption and four desorption reactions of the CaH2 + MgB2 and 3CaH(2) + CaF2 + 4MgB(2) systems were investigated by means of volumetric measurements, high-pressure differential scanning calorimetric technique (HP-DSC), B-11 and 19F MAS NMR spectroscopy, and in situ synchrotron radiation powder X-ray diffraction (SR-PXD). It was observed that already during the mixing of the reactants formation of a nonstoichiometric CaF2-xHx solid solution takes place. Formation of the CaF2-xHx solid solution sensibly affects the overall hydrogen sorption reactions of the system CaH2 + MgB2.

Details

Authors
  • C. Pistidda
  • F. Karimi
  • S. Garroni
  • A. Rzeszutek
  • C. Bonatto Minella
  • C. Milanese
  • T. T. Le
  • L. H. Rude
  • J. Skibsted
  • T. R. Jensen
  • C. Horstmann
  • Carsten Gundlach
  • M. Tolkiehn
  • P. K. Pranzas
  • A. Schreyer
  • T. Klassen
  • M. Dornheim
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Natural Sciences
  • Physical Sciences
Original languageEnglish
Pages (from-to)28409-28417
JournalJournal of Physical Chemistry C
Volume118
Issue number49
StatePublished - 2014
Peer-reviewedYes