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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 >Variation of hydriding kinetic properties in massive samples of the LaAl_x Ni_(5-x) system as a function of the Al content
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Variation of hydriding kinetic properties in massive samples of the LaAl_x Ni_(5-x) system as a function of the Al content

机译:LaAl_x Ni_(5-x)系统大量样品中氢化动力学特性随Al含量的变化

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摘要

The hydriding kinetics of the LaAl_x Ni_(5-x) (0<=x<=1.4) system was monitored for massive rectangular parallelepiped samples utilizing hydrogen pressures up to 70 atm and temperatures between 238 and 423 K. The apparent activation energies for each composition are derived from the temperature dependence of the reaction rate constants at given P/P_(eq) ratios, where P is the applied experimental hydrogen pressure and P_(eq) is the equilibrium pressure at a given temperature. The activation energies appear to be model-independent and indicate a minimum at x = 0.25, resulting in a maximum hydriding reaction rate in the vicinity of this composition. This behavior correlates well with some bulk properties of the LaAl_xNi_(5-x) intermetallic system and the corresponding hydrides.
机译:使用高达70 atm的氢气压力和238至423 K的温度监测大量的长方体样品的LaAl_x Ni_(5-x)(0 <= x <= 1.4)系统的氢化动力学。在给定的P / P_(eq)比率下,由反应速率常数的温度依赖性得出成分,其中P为施加的实验氢压力,P_(eq)为给定温度下的平衡压力。活化能似乎与模型无关,并且在x = 0.25处显示最小值,从而导致该组合物附近的最大氢化反应速率。此行为与LaAl_xNi_(5-x)金属间化合物体系和相应的氢化物的某些本体性能密切相关。

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