Kinetic isotope effects in hydrogen absorption by α‐zirconium
Kinetic isotope effects in hydrogen absorption by α‐zirconium
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α-锆吸收氢的动力学同位素效应
DOI：
10.1063/1.448075
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
T. Kawai
中科院分区：
文献类型：
--
作者：
S. Naito;T. Hashino;T. Kawai
在773-1073 K温度范围内研究了气态氢和氘在多晶α-锆金属中的吸收速率及其溶解度。被认为是一个模型，其中的吸收过程是由三个连续的步骤：解离吸附，跳跃的吸附原子进入间隙网站，并扩散到金属散装。这些步骤和溶解度的同位素效应的表达式制定的绝对速率理论。这些表达式显示了同位素效应的相互依赖性。如果考虑到氢和氘在气相、金属体和金属表面振动的量子修正，则实验结果可用表达式来描述。吸附，以及扩散，是缓慢的，溶解度是较小的氘比氢在本调查中施加的实验条件下。
The absorption rates for gaseous hydrogen and deuterium and their solubility in polycrystalline α‐zirconium metals have been investigated over the temperature range of 773–1073 K. A model is considered in which the absorption process is composed of three successive steps: the dissociative adsorption, the jump of the adsorbed atom into the interstitial site, and its diffusion into the metal bulk. The expressions for the isotope effects corresponding to these steps and to the solubility are formulated in terms of the absolute rate theory. The expressions show a dependence of the isotope effects on each other. The experimental results are adequately described by the expressions if the quantum corrections for the vibrations of hydrogen and deuterium in the gas phase, in the metal bulk, and on the metal surface are taken into account. The adsorption, as well as the diffusion, is slower and the solubility is smaller for deuterium than for hydrogen under the imposed experimental conditions in this investigation.