Analysis of hydrogen mobility in Nb-based alloy membranes in view of new description of hydrogen permeability based on hydrogen chemical potential
Analysis of hydrogen mobility in Nb-based alloy membranes in view of new description of hydrogen permeability based on hydrogen chemical potential
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DOI：
10.1016/j.jallcom.2014.12.265
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发表时间：
2015-10-05
影响因子：
6.2
通讯作者：
Murata, Y.
中科院分区：
文献类型：
--
作者：
Suzuki, A.;Yukawa, H.;Murata, Y.
为了研究合金化对氢原子迁移率的影响，从氢化学势的新描述出发，分析了Nb基合金膜的氢渗透性。归一化氢通量J.L与PCT因子f(PCT)之间存在线性关系。氢原子的迁移率用Arrhenius方程表示。然后，研究了合金化对激活能E和指前因子B-0的影响。结果表明，指前因子LNb(0)的对数与激活能E成正比，换言之，当一个因子因合金化而减小时，另一个因子也线性减小。结果表明，在Nb中添加Ru、W和Mo后，在低于相交温度T-int的低温下，氢的扩散率有所提高。(C)2015爱思唯尔B.V.保留所有权利。
Hydrogen permeability of Nb-based alloy membranes have been analyzed in view of the new description of hydrogen permeation based on hydrogen chemical potential in order to investigate the alloying effects on the mobility of hydrogen atom, B. There is a liner relationship between the normalized hydrogen flux, J.L, and the PCT factor, f(PCT). The mobility of hydrogen atom is expressed in a format of the Arrhenius equation. Then, the alloying effects on the activation energy, E, and the pre-exponential factor, B-0, have been investigated. It is found that logarithm of the pre-exponential factor, lnB(0), is proportional to the activation energy, E. In other words, when one factor decreases by alloying, the other factor also decreases linearly. As a result, the addition of ruthenium, tungsten and molybdenum into niobium enhances the hydrogen diffusivity at low temperature below the intersection temperature, T-int. (C) 2015 Elsevier B.V. All rights reserved.