Accession Number : AD0787669

Title :   Diffusion of H and D in TiO2: Suppression of Internal Fields by Isotope Exchange,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

Personal Author(s) : Johnson,O. W. ; Paek,S. H. ; DeFord,J. W.

Report Date : 1974

Pagination or Media Count : 33

Abstract : Measurements of H and D diffusion in TiO2, using the isotope exchange technique described in the preceding paper, are reported. Use of this technique resulted in diffusion which was accurately described by Fick's law, as predicted theoretically, in sharp contrast to single ion diffusion, where dramatic departures from classical diffusion theory were observed. Ionic conductivity measurements are reported, which agree well with the bulk diffusion measurements, and permit extension of the temperature range of the measurements for c-axis diffusion from 125 to 750C, corresponding to a range of more than 4 orders of magnitude in D. The measured diffusion parameters were found to be essentially independent of sample purity, although it was observed that significant concentrations of lattice defects sharply inhibited H diffusion. (Modified author abstract)

Descriptors :   *Titanium oxides, *Diffusion, *Hydrogen, *Deuterium, Ionic current, Isotope exchange, Electrical conductivity, Coefficients, Crystal defects, Ions

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE