Soru, Sabrina and Taras, Alessandro and Pistidda, Claudio and Milanese, Chiara and Bonatto Minella, Christian and Masolo, Elisabetta and Nolis, Pau and Baró, Maria Dolores and Marini, Amedeo and Tolkiehn, Martin and Dornheim, Martin and Enzo, Stefano and Mulas, Gabriele Raimondo Celestino and Garroni, Sebastiano (2014) Structural evolution upon decomposition of the LiAlH4 + LiBH4 system. Journal of Alloys and Compounds, Vol. 615 (Supplement 1), p. S693-S697. ISSN 0925-8388. Article.
Full text not available from this repository.
In the present work we focus the attention on the phase structural transformations occurring upon the desorption process of the LiBH4 + LiAlH4 system. This study is conducted by means of manometric–calorimetric, in situ Synchrotron Radiation Powder X-ray Diffraction (SR-PXD) and exsitu Solid State Magic Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR) measurements. The desorption reaction is characterized by two main dehydrogenation steps starting at 320 and 380 °C, respectively. The first step corresponds to the decomposition of LiAlH4 into Al and H2 via the formation of Li3AlH6 whereas the second one refers to the dehydrogenation of LiBH4 (molten state). In the range 328–380 °C, the molten LiBH4 reacts with metallic Al releasing hydrogen and forming an unidentified phase which appears to be an important intermediate for the desorption mechanism of LiBH4–Al-based systems. Interestingly, NMR studies indicate that the unknown intermediate is stable up to 400 °C and it is mainly composed of Li, B, Al and H. In addition, the NMR measurements of the annealed powders (400 °C) confirm that the desorption reaction of the LiBH4 + Al system proceeds via an amorphous boron compound.
I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore
Repository Staff Only: item control page