Abstract
Surface diffusion on aluminum oxide was studied by measuring the growth rate of grain boundary grooves at high temperatures. Three materials were studied, high-purity aluminum oxide crystals containing low-angle subgrain boundaries and two grades of polycrystalline sintered alumina having different impurity contents. The rate of grooving on the higher-purity surfaces was 1/3 to 1/2 that on the lower-purity surfaces. The activation energy for surface diffusion on the high-purity crystals and on one of the sintered materials is about 130 kcal/mole, compared to 75 kcal/mole for the less-pure sintered material. Intentional impurity additions to the surfaces indicate that small amounts of impurities can appreciably change the rate of groove growth.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
W. M. Robertson and R. Chang, in: Materials Science Research, Vol. 3 (W. W. Kriegel and H. Palmour, III, eds.), Plenum Press, New York, 1966, pp. 49–60.
W. M. Robertson, in: Sintering and Related Phenomena, (G. C. Kuczynski, N. A. Hooton, and C. F. Gibbon, eds.), Gordon and Breach, New York, 1967, pp. 215–32.
W. W. Mullins, J. Appl. Phys. 28: 333–39 (1957).
W. W. Mullins, Trans. Met. Soc. AIME 218: 354–61 (1960).
S. C. Carniglia, in: Materials Science Research, Vol. 3 (W. W. Kriegel and H. Palmour, III, eds.), Plenum Press, New York, 1966, pp. 425–71.
R. J. Jorgenson, J. Am. Ceram. Soc. 48: 207–210 (1965).
A. E. Paladino and W. D. Kingery, J. Chem Phys. 37: 957–62 (1962).
Y. Oishi and W. D. Kingery, J. Chem. Phys. 33: 480–86 (1960).
J.Y. Choi and P. G. Shewmon, Trans. Met. Soc. AIME 230: 123–132 (1964).
Y. Oishi and W. D. Kingery, Phys. Metals and Metallog 13 (4): 102–108 (1962).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1969 Springer Science+Business Media New York
About this paper
Cite this paper
Robertson, W.M., Ekstrom, F.E. (1969). Impurity Effects in Surface Diffusion on Aluminum Oxide. In: Gray, T.J., Fréchette, V.D. (eds) Kinetics of Reactions in Ionic Systems. Materials Science Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6461-8_14
Download citation
DOI: https://doi.org/10.1007/978-1-4899-6461-8_14
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4899-6224-9
Online ISBN: 978-1-4899-6461-8
eBook Packages: Springer Book Archive