title: Enhanced oxygen diffusivity in interfaces of nanocrystalline ZrO2.Y2O3.
abstract: First measurements of oxygen grain boundary diffusion coefficients in nanocrystalline yttria-doped ZrO(2) (n-ZrO(2).6.9 mol % Y(2)O(3)) are presented. The (18)O diffusion profiles measured by secondary ion mass spectroscopy are much deeper in the nanocrystalline specimens than in single crystals. An oxygen diffusivity, D(B), in the grain boundaries can be deduced, which is approximately 3 orders of magnitude higher than in single crystals. From the present data the temperature variation of the oxygen grain boundary diffusivity, D(B) = 2.0 x 10(-5) exp (-0.91 eVk(B)T) m(2)s, and the oxygen surface exchange coefficient, k = 1.4 x 10(-2) exp (-1.13 eVk(B)T) ms, are derived.
authors.affiliation: Institut für Theoretische und Angewandte Physik, Universität Stuttgart, 70550 Stuttgart, Germany. gknoener@itap.physik.uni-stuttgart.de
authors.forename: Gregor
authors.initials: G
authors.lastname: Knoner
authors.forename: Klaus
authors.initials: K
authors.lastname: Reimann
authors.forename: Ralf
authors.initials: R
authors.lastname: Rower
authors.forename: Ulf
authors.initials: U
authors.lastname: Sodervall
authors.forename: Hans-Eckhardt
authors.initials: HE
authors.lastname: Schaefer