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Cation Solute Segregation to Surfaces of MgO and α-Al2O3

Published online by Cambridge University Press:  22 February 2011

Robert C. McCune
Robert C. McCune*
Affiliation:
Research Staff, Ford Motor Company, Dearborn, MI 48121-2053
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Abstract

Low energy ion scattering spectroscopy (LEIS) and Auger electron spectroscopy (AES) were used to measure the extent of impurity cation solute segregation to MgO (100) and various surfaces of single and polycrystalline Al2O3, following equilibration anneals at temperatures above 1000°C in ulfra-high vacuum. Systems studied include Ca/MgO, Ni/MgO, Ca/A12O3 and Y/Al2O3. Calcium segregation to MgO (100) is reversible and exhibits monofayer adsorption behavior with an enthalpy of segregation of approximately -55 kJ/mole with maximum occupation of surface cation sites approaching 40%. Nickel segregation to MgO(100) is masked by a preferential segregation of calcium. Calcium segregation to A12O3 surfaces has been found to be transient with a maximum surface cation site occupation of less than 10% as determined by LEIS and estimated enthalpy of segregation in the range -go to -190 kJ/mole. Yttrium segregation to surfaces of a polycrystalline Al2O3 compact was limited by competing calcium segregation at temperatures be ow 1600°C. An estimated enthalpy of segregation for yttrium to A12O3 surfaces was in the range -23 to -43 kJ/mole, with maximum cation surface site occupation of about 15%. Practical limitations to free surface measurements of solute segregation in these materials are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 48: Symposium E – Applied Materials Characterization , 1985 , 27
Copyright
Copyright © Materials Research Society 1985

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References

REFERENCES

1. Overbury, S. H., Bertrand, P. A. and Somorjai, G. A., Chem. Reviews 75, 547 (1975).Google Scholar
2. Wynblatt, P. and Kux, R. C.: in Interfacial Segregation, edited by Johnson, W. C. and Blakely, J. M. (American Society for Metals, Metals Park, OH 1979) p. 115.Google Scholar
3. Abraham, F. F. and Brundle, C. R., J. Vac. Sci. Technol. 18, 506 (1981).CrossRefGoogle Scholar
4. Miedema, A. R., Z. Metallkunde 69, 455 (1978).Google Scholar
5. Kingery, W. D., J. Am. Ceram. Soc. 57,pp. 1 and 74 (1974).Google Scholar
6. Kingery, W. D.: in Advances in Ceramics, Vol.1, edited by Levinson, L. M. (American Ceramic Society, Columbus, OH 1981) p. 1.Google Scholar
7. Johnson, W. C., Metall. Trans. A. 8A, 1413 (1977).Google Scholar
8. Wynblatt, P. and McCune, R. C.: in Surfaces and Interfaces in Ceramic and Ceramic-Metal Systems, edited by Pask, J. A. and Evans, A. G. (Plenum, New York 1981) p. 83.Google Scholar
9. Marcus, H. L. and Fine, M. E., J. Am. Ceram. Soc. 55, 568 (1972).Google Scholar
10. Bender, B., Williams, D. B. and Notis, M. R., J. Am. Ceram. Soc. 63, 542 (1980).Google Scholar
11. McCune, R. C. and Wynblatt, P., J. Am. Ceram. Soc. 66,111 (1983).Google Scholar
12. McCune, R. C., PhD. Thesis, University of Michigan, Ann Arbor, MI (1983).Google Scholar
13. McCune, R. C. and Ku, R. C.: in Advances im Ceramics, Vol.10, edited by Kingery, W. D. (American Ceramic Society, Columbus, OH 1984) p. 217.Google Scholar
14. McLean, D., Grain Boundaries in Metals (University Press, Oxford 1957).Google Scholar
15. Colbourn, E. A., Mackrodt, W. C. and Tasker, P. W., J. Mater. Sci. 18, 1917 (1983.Google Scholar
16. Wolf, D., “Formation Energy of Point Defects in Free Surfaces and Grain Boundaries in MgO,” Presented at the 4th Europhysical Topical Conference on Lattice Defects in Ionic Crystals, Dublin, 1982.Google Scholar
17. Yan, M. F., Cannon, R. M. and Bowen, H. K., J. Appl. Phys. 54, 764 (1983).Google Scholar
18. Chiang, Y. M., Henriksen, A. F., Kingery, W. D. and Finello, D., J. Am. Ceram.- Soc. 64, 385 (1981).Google Scholar
19. Mackrodt, W. C.: in Advances in Ceramics, Vol 10, edited by Kingery, W. D. (American Ceramic Society, Columbus, OH 1984) p. 62.Google Scholar
20. Blakely, J. M. and Danyluk, S., Surf. Sci. 40, 37 (1973).Google Scholar
21. Marchut, L. and McMahon, C. J. Jr.: in Electron and Positron Spectroscopies in Materials Science and Engineering, edited by Buck, O., Tien, J.K. and Marcus, H. L. (Academic Press, New York 1979) p. 183.CrossRefGoogle Scholar
22. Wartenberg, H. V. and Prophet, E., Z. Anorg. u. Allgem. Chem. 208, 379 (1932).Google Scholar
23. Cimino, A., DeAngelis, B.A., Minelli, G., Persini, T. and Scarpino, P., J. Solid State Chem. 33, 403 (1980).Google Scholar
24. Rolin, M. and Thanh, P.-H., Rev. Hautes Temp. Refractaires 2, 175 (1965).Google Scholar
25. Johnson, W. C., Stein, D. F. and Rice, R. W.: in Grain Boundaries in Engineering Materials, edited by Walter, J. L., Westbrook, J. H. and Woodford, D. A. (Claitor's, Baton Rouge, LA 1975) p. 261.Google Scholar
26. Nanni, P., Stoddart, C.T.H. and Hondros, E. D., Mater. Chem. 1, 297 (1976).Google Scholar
27. Caslavsky, J. L. and Viechnicki, D. J., J. Mater. Sci. 15, 1709 (1980).Google Scholar
28. McCune, R. C., Anal. Chem. 51, 1249 (1979).Google Scholar