期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3386515
关键词
ab initio calculations; diffusion; hydrogen; interstitials; tungsten
资金
- European Communities Association between Euratom-Tekes
- European Commission
- Center for Scientific Computing (CSC) in Espoo, Finland
First principle calculations were used to study the hydrogen migration properties in bulk bcc tungsten. Hydrogen has low solubility in tungsten and occupies the tetrahedral interstitial site with an energy difference of 0.38 eV compared to the octahedral interstitial site. The hydrogen diffusion coefficient was evaluated using the harmonic transition state theory and was found to agree with the experimental results at temperatures above 1500 K. The height of the migration barrier between two adjacent tetrahedral sites was found to be 0.21 eV, which is lower than the value 0.39 eV obtained for the migration barrier from degassing measurements in the temperature range between 1100 and 2400 K. The tunneling correction to the diffusion rate provides much better agreement with the experimental result at 29 K than the extrapolated experimental D from high temperature measurements. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3386515]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据