a1 Department of Materials Science and Engineering, The University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272
Rutherford backscattering spectrometry (RBS) was used to measure the titanium concentration profile for hydrogen-reduced, vacuum-reduced, and as-received, stoichiometric rutile. These profiles give the degree of reduction, specifically, the extent of oxygen deficiency, as a function of depth below the sample surface. Using forward-recoil spectrometry (FRES), the hydrogen-reduced rutile was found to contain more bulk and near-surface hydrogen than the as-received, stoichiometric rutile. This observation provides additional evidence for a hydrogen-diffusion model for the reduction of rutile in a hydrogen environment.
(Received November 06 1992)
(Accepted March 05 1993)
p1 Present address: National Institute of Standards and Technology, Gaithersburg, Maryland 20899.
p2 Present address: AT&T Bell Laboratories, Murray Hill, New Jersey 07974.