The intrinsic and mechanically modified thermal stabilities of the α-, β-, and γ-phases of AlH3 have been experimentally determined. The thermogravimetric profiles of the α- and γ-phases exhibit dehydriding reactions in the temperature range of 370-450 K. The amounts of hydrogen released are nearly 9 mass∈%. The profile of the β-phase shows the continuous dehydriding reactions, which differs from the other two phases. The values of the enthalpy of dehydriding reactions ΔHdehyd. are determined to be 6.0±1.5, -3∼-5 and 1.0±0.5 kJ/mol∈H2 for the α-, β- and γ-phases, respectively. The milling-time dependences of the powder X-ray diffraction measurement and thermal analyses indicate the occurrence of the dehydriding reactions both in the α- and γ-phases during milling, but there is no drastic change in the β-phase.
|Number of pages||4|
|Journal||Applied Physics A: Materials Science and Processing|
|Publication status||Published - 2006 Apr|
ASJC Scopus subject areas
- Materials Science(all)