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Effect of the partial replacement of CaH2 with CaF2 in the mixed system CaH2 + MgB2

Pistidda, Claudio and Karimi, Fahim and Garroni, Sebastiano and Rzeszutek, Agnieszka and Bonatto Minella, Christian and Milanese, Chiara and Le, T.T. and Rude, Line H. and Skibsted, Jørgen and Jensen, Torben R. and Horstmann, Christian and Gundlach, Carsten and Tolkiehn, Martin and Pranzas, Philipp Klaus and Schreyer, Andreas and Klassen, Thomas and Dornheim, Martin (2014) Effect of the partial replacement of CaH2 with CaF2 in the mixed system CaH2 + MgB2. The Journal of Physical Chemistry. C, Vol. 118 (49), p. 28409-28417. ISSN 1932-7447. eISSN 1932-7455. Article.

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DOI: 10.1021/jp508780b

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 3CaH2 + CaF2 + 4MgB2 systems were investigated by means of volumetric measurements, high-pressure differential scanning calorimetric technique (HP-DSC), 11B and 19F MAS NMR spectroscopy, and in itu 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.

Item Type:Article
ID Code:10787
Status:Published
Refereed:Yes
Uncontrolled Keywords:CaH2 replacement, CaF2, mixed system CaH2 + MgB2
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:American Chemical Society
ISSN:1932-7447
eISSN:1932-7455
Deposited On:10 Feb 2015 13:38

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