Hostname: page-component-6bf8c574d5-w79xw Total loading time: 0 Render date: 2025-02-22T08:03:11.338Z Has data issue: false hasContentIssue false
  • English
  • Français

Composition Dependent Ionic Conductivity in ß''-Alumina

Published online by Cambridge University Press:  28 February 2011

C. Lane Rohrer  and
G. C. Farrington
C. Lane Rohrer
Affiliation:
University of Pennsylvania, Department of Materials Science and Engineering, Philadelphia, PA 19104, U.S.A
G. C. Farrington
Affiliation:
University of Pennsylvania, Department of Materials Science and Engineering, Philadelphia, PA 19104, U.S.A
Get access

Abstract

Molecular dynamics simulations were carried out in an attempt to reproduce and explain the differing composition dependencies of the ionic conductivities of Na(I)-Ba(II)- and Na(I)-Sr(II)- ß' '-alumina. Impedance spectroscopy measurements of Na1.67-2xBaxMg0.67Al10.33O17, where x = 0.0 - 0.835, showed a distinct minimum in the conductivity when x = 0.67, or 80% exchange of Ba(II) for Na(I). Evidence for mobile cation ordering at that composition was seen in the simulation results and the general change in conductivity with Ba(II) content was reproduced rather well. The results of a similar experimental study of Na(I)-Sr(II)-ß' '-alumina did not show a minimum in the conductivity, but our simulations incorrectly predicted the Sr(II) system to behave in the same fashion as the Ba(II) system. Possible reasons for this discrepancy are suggested, including problems with transferring potentials between oxides and the influence of absorbed water on the experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 119
Copyright
Copyright © Materials Research Society 1991

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Wolf, M.L., Walker, J.R., and Catlow, C.R.A., Solid State Ionics 13, 33 (1984).Google Scholar
2. Zendejas, M.A. and Thomas, J.O., Solid State Tonics 28&30, 46 (1988).Google Scholar
3. Rohrer, C. Lane and Farrington, G.C., submitted to Chem. of Materials.Google Scholar
4. Saltzberg, M.A., Thomas, J.O., Farrington, G.C., Chem. of Materials 1, 19 (1989).Google Scholar
5. Rohrer, G.S. and Farrington, G.C., J. of Solid State Chem. 85, 4628 (1990).Google Scholar
6. Thomas, J.O., Alden, M., and Farrington, G.C., Solid State Tonics 9&10, 301 (1983).Google Scholar
7. Sattar, S., Ghosal, B., Underwood, M.L., Mertway, H., Saltzberg, M.A., Frydrych, W.S., Rohrer, G.S., Farrington, G.C., J. Solid State Chem. 65, 231 (1986).Google Scholar
8. Underweiser, M., Orbach, R., Adams, S., and Dunn, B., submitted.Google Scholar
9. Walker, J.R., in Computer Simulation of Solids, 166, Lecture Notes in Physics, edited by Catlow, C.R.A. and Mackrodt, W.C. (Springer, Berlin, 1982).Google Scholar
10. Sangster, M.J.L. and Dixon, M., Advances in Physics 25, 247 (1976).Google Scholar
11. Walker, J.R. and Catlow, C.R.A., J. Phys. C 1, 6151 (1982).Google Scholar
12. Lewis, G.V., Physica 131B, 114 (1985).Google Scholar
13. Gordon, R.G. and Kim, Y.S., J.Chem. Phys. 56, 3122 (1972).Google Scholar
14. Gillan, M.J., Physica 131B, 157 (1985).Google Scholar
15. Murch, G.E. and Thorn, R.J., Phil. Mag. 36, 529 (1977).CrossRefGoogle Scholar
16. Gool, W. Van and Bottelberghs, P.H., J. Solid State Chem. 2, 59 (1973).Google Scholar
17. Rohrer, G.S., Thomas, J.O., and Farrington, G.C., Chemistry of Materials 2, 395 (1990).Google Scholar
18. Rohrer, G.S., Thomas, J.O., and Farrington, G.C., submitted to Chemistry of Materials.Google Scholar