Li Yuexin, Tian Xiaolin, Yang Wenkui, et al. First-principles Analysis of Hydrogen Atom Diffusion Behavior inε-ZrH2[J]. Special Casting & Nonferrous Alloys, 2021,41(5):562-566.
Li Yuexin, Tian Xiaolin, Yang Wenkui, et al. First-principles Analysis of Hydrogen Atom Diffusion Behavior inε-ZrH2[J]. Special Casting & Nonferrous Alloys, 2021,41(5):562-566. DOI: 10.15980/j.tzzz.2021.05.008.
In order to understanding the formation and microscopic mechanism of zirconium hydrogen precipitation
a diffusion model of hydrogen atoms in ε-ZrH
2
was established. Based on the first principles
the properties of ε-ZrH
2
gap occupancy stability
hydrogen atom diffusion path
and diffusion mobility under different pressures were investigated. The results indicate that ε-ZrH
2
is a body-centered tetragonal structure with two octahedral gaps and two tetrahedral gaps. The interstitial sites of hydrogen atoms are all stable. Hydrogen atoms preferentially occupy tetrahedral interstitial sites and tend to diffuse along the c-axis. Pressure can increase the diffusion activation energy and reduce the diffusion coefficient