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The Influence of Cation Stoichiometry on the Electrical Conductivity and High-Temperature Stability of MgO.nAl203 Spinel*

Published online by Cambridge University Press:  21 February 2011

E. Sonder  and
L. S. Darken
E. Sonder
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box X, Oak Ridge, TN 37831
L. S. Darken
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box X, Oak Ridge, TN 37831
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Abstract

The electrical conductivity of MgO:nAl2O3spinel has been measured for 1 < n < 3.6 for temperatures between 500 and 1400°C. The results for nonstoichiometric spinel are significantly different from those of stoichiometric material. Spinel with n up to 2 was found to be stable at temperatures above 1000°C, whereas, MgO:3.6Al2O3 exhibited multiple indications of instability and disproportionation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 24: Symposium B – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1983 , 215
Copyright
Copyright © Materials Research Society 1984

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Footnotes

**

Present address: Tennelec, Inc.Oak RidgeTN 37830.

*

Research sponsored by the Division of Materials Sciences, U.S. Department of Energy under contract W-7405-eng-26 with Union Carbide Corporation.

References

REFERENCES

1. Sonder, Edward, J. Am. Ceram. Soc. 66, 50 (1983).CrossRefGoogle Scholar
2. Weeks, R. A. and Sonder, E., J. Am. Ceram. Soc. 63, 92 (1980).CrossRefGoogle Scholar
3. Wang, C. C., J. Appl. Phys. 40, 3433 (1969);CrossRefGoogle Scholar
samples H9 and H19 obtained courtesy of Hickmott, R., Wright Patterson AFB, Ohio, 45433; sample CCIII of composition MgO.3.6Al203 was obtained from Commercial Crystals, 111 Chevalier Ave., Amboy, S., N.J. 08879.Google Scholar
4. Sample S2 was prepared by Single Crystal Products Division, Union Carbide Corporation, San Diego, CA.Google Scholar
5. The microscope used was a Model 40, International Scientific Instruments, Inc., Santa Clara, CA 95050.Google Scholar
6. The fluorescence attachment and software were obtained from Princeton Gamma Tech, Princeton, N.J. 08540.Google Scholar
7. Since the heated sample was used for making conductivity measurements it underwent a complex thermal history, being heated to above 1000°C and cooled at least three times. We estimate that the sample experienced temperatures > 1100°C for approximately 48 hours. The maximum temperature was 1530°C.+1100°C+for+approximately+48+hours.+The+maximum+temperature+was+1530°C.>Google Scholar
8. Bates, J. L. and Garnier, J. E., J. Am. Ceram. Soc. 64, C138 (1981).CrossRefGoogle Scholar
9. Brun, E., Hafner, S., Hartman, D., and Laves, F., Z. Naturwiss. 12, 227 (1960).Google Scholar
10. Schmocker, U., Boesch, H., and Waldner, F., Phys. Lett. 40A, 237 (1972).CrossRefGoogle Scholar
11. Grimes, N. W., Thompson, P., and Kay, H. F., Proc. Roy. Soc. (London) A386, 333 (1983).Google Scholar
12. Mishra, A. K. and Thomas, G., Acta Cryst. A33, 678 (1977).Google Scholar
13. Suzuki, I. and Kumazawa, M., Phys. Chem. Minerals 5, 279 (1980).Google Scholar