Interaction of titanium and vanadium with carbon dioxide in heating

Improving a gas ion source for 14C AMS

“…2TiC þ O 2 ðO 2 þ Ti ! TiO 2 Þ Vlasyuk et al found carbide formation from CO 2 as a side reaction at about 800°C and as the predominant process at 1000°C [27]. This reaction will occur in a sputter ion source since 15 keV Cs + ions with a current of $1 mA (heating power $15 W) impact on a surface area smaller than 1 mm 2 resulting in temperatures near 1000°C.…”

“…A more feasible explanation for the carbon fixation on the target material is due to the gettering effect as titanium is known to be a good gettering material for a number of gasses, including CO 2 [26]. The gettering of CO 2 is irreversible and the X-ray data revealed titanium carbide (TiC) as a reaction product that forms predominantly at high temperatures [26,27]. The following reaction equations describe the dominant processes with CO 2 at different temperatures [27]: 600-1000 C : 2CO 2 þ Ti !…”

“…The gettering of CO 2 is irreversible and the X-ray data revealed titanium carbide (TiC) as a reaction product that forms predominantly at high temperatures [26,27]. The following reaction equations describe the dominant processes with CO 2 at different temperatures [27]: 600-1000 C : 2CO 2 þ Ti ! 2CO þ TiO 2 And more importantly: 800-1000 C : 2CO þ 2Ti !…”