Intrinsic and mechanically modified thermal stabilities of α-, β- and γ-aluminum trihydrides AlH3
Intrinsic and mechanically modified thermal stabilities of α-, β- and γ-aluminum trihydrides AlH3
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DOI：
10.1007/s00339-005-3468-x
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
S. Orimo;Y. Nakamori;T. Kato;C. Brown;C. Jensen
中科院分区：
文献类型：
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作者：
S. Orimo;Y. Nakamori;T. Kato;C. Brown;C. Jensen
实验测定了alh3的α-、β-和γ-相的本征和机械修饰的热稳定性。在370 ~ 450 K范围内，α-相和γ-相的热重谱表现为脱氢反应。氢气的释放量接近9%。与其他两相不同的是，β相表现为连续的脱氢反应。脱氢反应的焓值ΔHdehyd。分别为6.0±1.5，-3 ~ -5和1.0±0.5 kJ/mol h2α -， β-和γ-相。粉末x射线衍射测量和热分析结果表明，在磨矿过程中α-相和γ-相均发生了脱氢反应，而β-相没有发生明显变化。
The intrinsic and mechanically modified thermal stabilities of the α-, β-, and γ-phases of AlH3have 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 H2for 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.