In situ Profiles of Oxygen Diffusion in SrTiO3: Bulk Behavior and Boundary Effects
- 1 February 1997
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 80 (2) , 279-285
- https://doi.org/10.1111/j.1151-2916.1997.tb02827.x
Abstract
Diffusion profiles have been recorded in situ and evaluated using an optical technique. In this way, bulk diffusion coefficients have been reliably and quantitatively measured. It is shown that the values agree with calculations without using adjustable parameters if the coupling of the diffusing species to internal redox changes of the dopants is accounted for. Measurements on single crystals and on bicrystals with and without crack formation provide worthwhile information on the influence of free relaxed surfaces, freshly produced (crack) surfaces, and grain boundaries on the surface reaction rate and diffusional process. The inward diffusion of oxygen via crack surfaces is characterized by enhanced diffusion coefficients.Keywords
This publication has 16 references indexed in Scilit:
- Partial Conductivities in SrTiO3: Bulk Polarization Experiments, Oxygen Concentration Cell Measurements, and Defect‐Chemical ModelingJournal of the American Ceramic Society, 1995
- Optical absorption relaxation applied to SrTiO3 and ZrO2: An in-situ method to study trapping effects on chemical diffusionSolid State Ionics, 1994
- An Optical In‐Situ Method to Study Redox‐Kinetics in SrTiO3Berichte der Bunsengesellschaft für physikalische Chemie, 1993
- Mass Transport in the Presence of Internal Defect Reactions—Concept of Conservative Ensembles: I, Chemical Diffusion in Pure CompoundsJournal of the American Ceramic Society, 1993
- A high‐temperature study of defect‐induced optical absorption in nickel oxide, Ni1−δOBerichte der Bunsengesellschaft für physikalische Chemie, 1992
- Visual observation of chemical diffusion in stabilized zirconiaApplied Physics A, 1991
- Bulk Conductivity and Defect Chemistry of Acceptor‐Doped Strontium Titanate in the Quenched StateJournal of the American Ceramic Society, 1991
- dc Electrical Degradation of Perovskite‐Type Titanates: II, Single CrystalsJournal of the American Ceramic Society, 1990
- Nonstoichiometry in SrTiO3Journal of the Electrochemical Society, 1981
- Photochromism in Transition-Metal-Doped SrTiPhysical Review B, 1971