ON THE USE OF ION-SCATTERING TO EXAMINE THE ROLE OF HYDROGEN IN THE REDUCTION OF TIO2

Rutherford backscattering spectrometry (RBS) was used to measure the t itanium concentration profile for hydrogen-reduced, vacuum-reduced, an d as-received, stoichiometric rutile. These profiles give the degree o f reduction, specifically, the extent of oxygen deficiency, as a funct ion of depth below the sample surface. Using forward-recoil spectromet ry (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-diffusio n model for the reduction of rutile in a hydrogen environment.