Hydrogen Absorption in Ti: A Comparison of Measurements Using Elastic Recoil Detection and Nuclear Resonant Reactions
Abstract
The concentration-depth profile of absorbed hydrogen in Ti metal has been measured using a variety of nuclear techniques capable of providing simultaneously the surface and bulk concentration of hydrogen. Results for the experiments are contrasted in terms of the associated depth resolution, sensitivity and beam-induced damage of each technique. The composition of the Ti surface was characterized before and after hydrogen exposures using Auger electron spectroscopy. AES results show that sulfur, which segregates to the surface at elevated temperatures, is replaced at room temperature by adsorbed oxygen present as an impurity in the hydrogen gas. The sulfur-oxygen replacement is less effective at elevated temperatures. At 450 C the sulfur concentration at the surface is not reduced by exposure to oxygen, and no oxygen is observed by AES.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1998
- Bibcode:
- 1998APS..MAR.K3858T