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Structural evolution upon decomposition of the LiAlH4 + LiBH4 system

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.

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DOI: 10.1016/j.jallcom.2013.12.027


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.

Item Type:Article
ID Code:10267
Uncontrolled Keywords:Hydrogen storage materials, LiBH4, Synchrotron Radiation Powder X-ray Diffraction, Solid State Magic Angle Spinning (MAS), Nuclear Magnetic Resonance (NMR)
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier Science
Additional Information:Paper presented at the 20th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM 2013), held in Torino on June 30-July 5, 2013.
Deposited On:05 Nov 2014 13:28

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