Long-Range Migration of Self-Interstitial Atoms in Tungsten

An object Kinetic Monte Carlo Simulation of the dynamics of helium and point defects in tungsten

“…Indeed stage I of the isochronal annealing resistivity recovery of irradiated tungsten, which is attributed to the motion of SIAs, is composed of many peaks: 8 intrinsic recovery stages are mentioned by Dausinger [23], 6+1 by Di Carlo [24] while 5 sub-stages were observed by Coltman et al [25] and Maury and coworkers [26]. These peaks evolve or not with dose or with the amount of impurities and the migration energy deduced by the different authors varies from 0.08 [9] to 0.54 eV [27]; More recently, Tanimoto [28] even proposed that the SIA is mobile below 1.5 K. Recent [29] molecular dynamics simulations of SIA and SIA cluster motion in tungsten using an interatomic potential derived from ab initio calculations indicate that the SIA indeed moves very quickly, with a migration energy of 0.013 eV. The SIA being a h1 1 1i crowdion [13,29] it moves along h1 1 1i directions in a 1D type motion.…”

Molecular dynamics simulations of cumulative helium bombardments on tungsten surfaces

“…The migration energy of a SIC in W has been reported to be 0.05 eV in ref. [25][26] and 0.02 eV in ref. [24].…”

Biaxial strain effects on adatom surface diffusion on tungsten from first principles

“…Central to understanding such surface evolution process is the development of a clear picture of how atoms diffuse on the W surface under these conditions. Over the past decade, numerous studies have focused on defect physics in bulk tungsten [23][24][25][26][27][28] . As an instance, Becquart and Domain calculated migration energy and binding energy of helium atom/cluster in W 29 .…”