Surface modifications and erosion yields of silicon and titanium doped graphites due to low energy D(+) bombardment
Influences of low energy D(+) ion bombardment and target temperature on surface topography, surface concentration and erosion yield of carbon based binary compounds were investigated. The samples contained 10 at% Si and 10 at% Ti, respectively. The surface concentration was determined in situ by Auger electron spectroscopy and the topography ex situ by scanning electron microscopy. During low energy D(+) bombardment a pronounced conelike surface developed with silicon respective titanium rich 'caps' protecting the underlaying carbon rich shafts from erosion. The average dopant surface concentration was up to 7 times the bulk concentration. The erosion mechanism was determined by surface concentration and chemical state of the surface. At high temperatures carbidic bindings dominated, while at room temperature a mixture of graphite and carbide covered the surface.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 230 (1996) pp. 208-213
Record Number: 199611299 / Last updated on: 1996-11-11
Original language: en
Available languages: en