Skip to main content Accessibility help
×
Home

Characterization of Long Period Polytypoid Structures in The Al2O3-AlN System

  • Kannan M. Krishnan (a1), R.S. Rai (a1), G. Thomas (a1), N.D. Corbin (a2) and J.W. McCauley (a2)...

Abstract

Long period polytypoid structures observed along the pseudobinary Al2O3-AlN composition join at a composition of 95 mol% A1N have been investigated by convergent beam electron diffraction and lattice imaging. Two new long period structures, 32H (Ramsdell notation) and 16H with c-periodicities of 8.3 nm and 4.07 nm respectively, have been independently identified by these two techniques. However, the 32H polytypoid was sometimes found to be intergrown with faulted 27R long period structure of periodicity 7.2 nm. Further, it has been shown that the 32H polytypoid is stabilized by local compositional fluctuations during the sintering process.

Copyright

References

Hide All
1. Jack, K.H., J. Materials Science, 11, 1135 (1976).
2. McCauley, J.W. and Corbin, N.D. in Progress in Nitrogen Ceramics, Riley, F.L. editor, Martinus Nijhoff, Boston, pp. 111 (1983).
3. McCauley, J.W. and Corbin, N.D., J. Am. Cer. Soc., 62, 476 (1979).
4. Krishnan, Kannan M., Thomas, G., Corbin, N.D. and McCauley, J.W., presented at the Pacific Coast Regional Meeting of the Am. Cer. Soc, Irvine, California, October (1985).
5. Corbin, N.D. and McCauley, J.W., Proc. of the Society of Photo-Optical Instrumentation Engineers, 297, 19 (1981).
6. Pauling, L., The Nature of the Chemical Bond, Cornell University Press, Ithaca, New York (1960).
7. Verma, A.R. and Krishna, P., Polymorphism and Polytypism in Crystals, Wiley and Sons, New York (1966).
8. Van Tendeloo, G., Faber, K.T. and Thomas, G., J. Materials Science, 18, 525 (1983).
9. Ramsdell, L.S., Amer. Mineral, 32, 64 (1947).
10. Steeds, J. in Introduction to AEM, edited by Hren, , Goldstein, and Joy, , Plenum Press, New York (1979).
11. Clarke, D.R., SEM/1, 77 (1978).
12. Thompson, D.P. in Progress in Nitrogen Ceramics, Riley, F.L. editor, Novrdohoff-Leyden, pp. 129 (1977).
13. Clarke, D.R., J. Amer. Cer. Soc. 63, 208 (1980).

Characterization of Long Period Polytypoid Structures in The Al2O3-AlN System

  • Kannan M. Krishnan (a1), R.S. Rai (a1), G. Thomas (a1), N.D. Corbin (a2) and J.W. McCauley (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.