Surface phenomena in the process of vanadium hydride formation

被引:5
作者
Dus, R
Nowicka, E
Wolfram, Z
机构
[1] Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warszawa
关键词
hydrogen; vanadium hydride; surface phenomena; precursor state;
D O I
10.1016/S0925-8388(96)02984-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface phenomena associated with the formation of vanadium hydride VHx were studied by measuring both the surface potential of thin V films and the H-2 pressure during hydrogen interaction with vanadium. It has been found that hydrogen forms two different adspecies here referred to as beta(-) and beta(+). The beta(+) adspecies forms a precursor in the fast incorporation process of atoms from the surface into the bulk of the metal. The bcc to fee phase transition which occurs during the VHx formation alters the kinetics of beta(+) incorporation. On the surface of V-0.6 a weakly bound atomic hydrogen adsorbate was found at 87 K under a H-2 pressure of the order of VH0.6 Pa.
引用
收藏
页码:496 / 499
页数:4
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