Formation of vacancy-helium complexes  at low-energy irradiation of tungsten

O. V. Dudka Department of Condensed Matter, National Scientific Center “Kharkov Institute of Physics and Technology” 61108, Kharkov, Ukraine
E. V. Sadanov Department of Condensed Matter, National Scientific Center “Kharkov Institute of Physics and Technology” 61108, Kharkov, Ukraine

Keywords: vacancy, interstitial atom, field evaporation, electron emission, adatom, radiation, erosion, vacancy-helium clusters

Abstract

The structure of subsurface area of tungsten after low-energy irradiation by helium ions was investigated by the method of field-ion microscopy. The emerging of the compact groups of interstitial atoms to the surface was registered. It was found the depleted zones consisted with vacancy–helium clusters, which arise as the result of crowding out own lattice atoms by helium. The depleted zones spatial configuration was investigated as a function of the dose. The processes of forming of vacancy–helium complexes and depleted zones in subsurface area at the high concentration of the implanted helium atoms were analyzed. The correlation between the size of depleted zones and the range of image forces was shown.

Downloads

Download data is not yet available.

References

Cavaille J.V., Drechsler M. Surface self-diffusion by ion impact // Surf. Sci. 1978. V. 75. P. 342−354.

Дудка О. В,Ксенофонтов В.А, Мазилов А.А, Мазилова Т. И, Саданов Е. В. Эрозия поверхности игольчатых нанокристаллов под действием бомбардировки ионами инертных газов // Металлофизика и новейшие технологии, 2013, т.35, №3, с. 407- 418.

Дудка О. В, Ксенофонтов В.А, Мазилов А.А, Саданов Е. В. Образование междоузельных атомов в поверхностных слоях вольфрама при имплантации гелия // Письма в ЖТФ, 2013, т.39, вып.21, с. 52-59.

Karl D. Hammond., Brian D. Wirth. Crystal orientation effects on helium ion depth distributions and adatom formation processes in plasma-facing tungsten // Journal of applied physics 2014, 116, 143301(1-8).

W. D. Wilson, C. L. Bisson, and M. I. Baskes. Self-trapping of helium in metals // Physical review B 1981, V. 24, N. 10, P. 5616-5623.

П.А. Березняк, В.В. Слезов. Расчет характеристик ионного потока, бомбардирующего вершину игольчатого автоэмиттера // Радиотехника и электроника,1972.-Т.XVII,вып.2.- с.354-358.

Min Li, Jiechao Cui, Jun Wang, Qing Hou. Molecular dynamics simulations of cumulative helium bombardments on tungsten surface // Nuclear Instruments and Methods in Physics Research B 337(2014) 45-54.