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Dislocations in Ceramics

Published online by Cambridge University Press:  02 July 2020

C. Barry Carter
C. Barry Carter*
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, MN, 55455
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Extract

Of the four groups of crystal lattice defects, i.e., point defects, dislocations, interfaces and particles, dislocations are often thought to be the least important for ceramic materials. However, they not only give considerable insight into interfaces (they can be thought of as the link between point defects and interfaces), but they are becoming more important as interest grows in epitactic oxide heterostructures.

The present paper provides a review of our current understanding of dislocations in ceramics. To simplify the discussion, we can separate the task into the following sections, namely

  1. Simple oxides (MgO, ZnO etc.)

  2. Simple non-oxides (A1N, GaN, SiC, TiC, etc.)

  3. More complex binary oxides (AI2O3, Fe203, etc.)

  4. Multicomponent oxides and complex non-oxides (spinels, garnets, S13N4)

  5. Interfacial dislocations (misfit, grain boundary, etc.)

The features which are most often associated with ceramic materials are their complex structures and large unit cells. For example in bcc garnets, the smallest Burgers vector for a perfect lattice dislocation is ∼0.8nm long.

Type
Microscopy of Ceramics and Minerals
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 550 - 551
Copyright
Copyright © Microscopy Society of America

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References

1. Ostyn, K.M. and Carter, C.B., 41st Annual Meeting EMSA, Phoenix, (1983) 50.Google Scholar

2. Ostyn, K.M. and Carter, C.B., Adv. Ceram. 6 (1983) 44.Google Scholar

3. Mallamaci, M.P., Bentley, J. and Carter, C.B., 51st Ann. Meeting MSA, Cincinnati, (1993) 928.Google Scholar

4. Castaing, J. and Mitchell, T.E., (1997) priv. comm.Google Scholar

5. Kronberg, M.L., Acta Met. 5 (1957) 507.CrossRefGoogle Scholar

6. Support through DoE grant # DE-FG02-92ER45645 and the CMS Bernd T. Matthias Scholar Program at Los Alamos National Labs (Terry Mitchell and Don Parkin) is gratefully acknowledged. Matt Johnson and Mike Mallamaci kindly provided the original images.Google Scholar