Preparation, characterization and decomposition of γ- and α-alane AlH 3

We prepared crystalline aluminum tri-hydride using an organometallic synthesis method, changing heat treatment conditions and crystallization condition, in toluene. The alane solvated solution in ether is studied by 27 Al- and 1 H NMR spectroscopy. Crystalline alane samples are characterized using Raman spectroscopy, X-rays diffraction (XRD) and in situ XRD. TGA-DTA tests are carried out on the solid samples to assess their thermal stability. It seems difficult to obtain α-AlH3 by heat treatment of α-AlH3. Treating samples mostly containing the crystalline α form of alane with dilute acid induces a better thermal stability.