Diffusion of Hydrogen and Deuterium in Rutile.
Abstract
The effect of internal electric fields, due to changing concentration of a diffusing ion, on the measured diffusion rate is considered. It is shown that the effect of such fields can completely dominate the diffusion process in a material like TiO2, leading to dramatic departures from Fick's law. An isotope exchange technique is described, which almost completely suppresses the internal fields and hence permits accurate determination of the real diffusion parameters. This technique has been applied to the diffusion of H and D in TiO2 and accurate values of all diffusion parameters for diffusion parallel and perpendicular to the c-axis have been obtained. The diffusion appears to be a simple thermally activated process over a wide range of temperatures, with activation energies of 0.59 and 1.28 eV, for diffusion parallel and perpendicular to the c-axis, respectively. Large departures from Fick's law behavior for single diffusion have also been demonstrated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 04, 1974
- Accession Number
- AD0776584
Entities
People
- Su-hyon Paek
Organizations
- University of Utah