Intrinsic and mechanically modified thermal stabilities of α-, β- and γ-aluminum trihydrides AlH3 |
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Authors: | S Orimo Y Nakamori T Kato C Brown CM Jensen |
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Institution: | (1) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;(2) Department of Chemistry, University of Hawaii, Honolulu, HI 96822, USA |
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Abstract: | 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. PACS 84.60.Ve; 51.30.+i; 81.70.Pg |
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