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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Dehydriding kinetics of a Mg-9.5 wt percent V sample studied by high pressure differential scanning calorimetry
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Dehydriding kinetics of a Mg-9.5 wt percent V sample studied by high pressure differential scanning calorimetry

机译：高压差示扫描量热法研究Mg-9.5 wt％V样品的脱水动力学

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摘要

The effect of the additive V on the rate of hydrogen desorption from MgH_2 is investigated using high-pressure differential scanning calorimetry (HP-DSC). The HP-DSC data obtained at different temperatures were analysed in terms of the nucleation and growth of the Mg phase within the hydride matrix and the subsequent movement of the phase boundary. Activation energies (E_A) obtained for the different steps show that the rate determining step is very much dependent on the conditions of dehydriding. The high value of E_A found (approx 600 kJ mol~(-1) H) for the nucleation step suggests that the V inhibits nucleation of the alpha-Mg from the hydrided Mg-9.5 wt percent V composite sample. This has been attributed to the precipitation of vanadium in the MgH_2 matrix creating accommodation strains, leading to dislocations around the vanadium particles. These can then act as sinks for the hydrogen thereby increasing the activation energy for nucleation of hydrogen.
机译：使用高压差示扫描量热法（HP-DSC）研究了添加剂V对MgH_2中氢的解吸速率的影响。分析了在不同温度下获得的HP-DSC数据，分析了氢化物基质中Mg相的形核和生长以及相界的随后移动。对于不同步骤获得的活化能（E_A）表明速率确定步骤很大程度上取决于脱水条件。在成核步骤中发现的高E_A值（约600 kJ mol〜（-1）H）表明，V抑制了从Mg-9.5 wt％的氢化Mg复合样品中α-Mg的成核。这归因于钒在MgH_2基质中的沉淀，产生了适应性应变，从而导致钒颗粒周围的位错。然后，它们可以充当氢的吸收器，从而增加氢成核的活化能。

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