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The decomposition pathway in LiBH₄âˆ’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 â‰¥ 450 Â°C and p(H₂) â‰¤ 3 bar), whereas simultaneous desorption of H₂ from LiBH₄ and formation of MgB₂ was observed at 400 Â°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.

Pressure and Temperature Influence on the Desorption Pathway of the LiBH₄−MgH₂ Composite System U. Bösenberg, D.B. Ravnsbæk, H. Hagemann, V. D'Anna, C. Bonatto Minella, C. Pistidda, W. Van Beek, T.R. Jensen, R. Bormann and M. Dornheim Journal of Physical Chemistry C, 114 (35) (2010), p15212-15217 DOI:10.1021/jp104814u \| unige:14742 \| Abstract \| Article HTML \| Article PDF
The decomposition pathway in LiBH₄âˆ’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 â‰¥ 450 Â°C and p(H₂) â‰¤ 3 bar), whereas simultaneous desorption of H₂ from LiBH₄ and formation of MgB₂ was observed at 400 Â°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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