Dislocations in ceramics

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Abstract
The type and nature of dislocations in oxide ceramics are reviewed and compared. Slip systems in these materials tend to be limited and difficult to activate, and Burgers vectors are often large. Thus, dislocation dissociation has been an important theme of research and climb dissociation has been frequently observed. Elasticity theory suggests that climb dissociation should be expected whenever diffusion can occur, and may be widespread in other materials deformed at elevated temperatures. Low temperature behaviour remains an area where much work needs to be done, particularly to assess the role of the Peierls barrier on the dislocation-core configuration. MST/270