Ion‐Probe Measurement of Oxygen Self‐Diffusion in Single‐Crystal Al 2 O 3
Authors:
- David J. ReedDRDavid J. Reed
- 1 January 1980
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 63 (1-2) , 88-92
Abstract
Anion self‐diffusion coefficients normal to (1102) were obtained for single‐crystal Al 2 O 3 in a 1.3 × 10 3 N/m 2 (10 −5 torr) vacuum at 1585° to 1840°C. Tracer was supplied from an initial 650 to 1300 A Al 2 18 O 3 layer produced by the oxidation of vapor‐deposited Al metal films in an 18 O 2 atmosphere at 520°C. Concentration gradients extended over depths of 3000 to 5000 A and were measured by mass spectrometry of material sputtered from the samples with a beam of Ar + ions. Crystals which had not been preannealed to remove surface damage displayed enhanced diffusion. Diffusion coefficients from preannealed crystals may be described by D 0 =6.4×10 5 cm 2 /s, with an activation energy of 188 ± 7 kcal/mol. The diffusion is interpreted as an extrinsic vacancy mechanism.Keywords
This publication has 13 references indexed in Scilit:
- Least‐Squares Analysis of the Thick‐Film Solution to the Diffusion EquationJournal of the American Ceramic Society, 1978
- Ion microprobe analysis of a potassium self-diffusion experiment in biotiteEarth and Planetary Science Letters, 1974
- An ion-microprobe study of the self-diffusion of Li+of lithium fluoridePhilosophical Magazine, 1974
- Plastic Deformation of Aluminum Oxide by Indentation and AbrasionJournal of the American Ceramic Society, 1971
- The Chemical Polishing of Sapphire and MgAl SpinelJournal of the Electrochemical Society, 1971
- Uranium and oxygen self-diffusion in UO2Journal of Nuclear Materials, 1969
- OXYGEN ISOTOPIC CONCENTRATION GRADIENT DETERMINATION WITH THE CAMECA ION MASS ANALYZERApplied Physics Letters, 1968
- Diffusion of oxygen in growing zirconia filmsJournal of Nuclear Materials, 1968
- Direct Observation of the Oxidation of Aluminum Single-Crystal SurfacesJournal of Applied Physics, 1963
- Self-Diffusion of Oxygen in Single Crystal and Polycrystalline Aluminum OxideThe Journal of Chemical Physics, 1960