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Pressure and Temperature Influence on the Desorption Pathway of the LiBH4−MgH2 Composite System

Bösenberg, Ulrike
Ravnsbæk, Dorthe B.
Minella, Christian Bonatto
Pistidda, Claudio
Van Beek, Wouter
Jensen, Torben R.
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Published in Journal of Physical Chemistry. C. 2010, vol. 114, no. 35, p. 15212-15217
Abstract The decomposition pathway in LiBH4−MgH2 reactive hydride composites was investigated systematically as a function of pressure and temperature. Individual decomposition of MgH2 and LiBH4 is observed at higher temperatures and low pressures (T ≥ 450 °C and p(H2) ≤ 3 bar), whereas simultaneous desorption of H2 from LiBH4 and formation of MgB2 was observed at 400 °C and a hydrogen backpressure of p(H2) = 5 bar. The simultaneous desorption of H2 from LiBH4 and MgH2 without intermediate formation of metallic Mg could not be observed. In situ X-ray diffraction (XRD) and infrared (IR) spectroscopy reveal the present crystalline and amorphous phases.
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Other version: http://pubs.acs.org/doi/pdf/10.1021/jp104814u

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Deposited on : 2011-03-18

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