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Refractory carbides and nitrides of transition metals, of actinides and of Si are interesting and technologically important because of their often unique physical properties. Transition metal carbides are extensively used as hard materials, the actinide compounds are developed as promising advanced fuels for liquid metal cooled fast breeder reactors, and SiC and Si(3)N(4) are applied as high technology ceramics in heat engines etc. The available knowledge on defect structure, point defect formation, migration and interaction to clusters and short-range ordering is summarised. The techniques involved range from elastic neutron diffraction, neutron diffuse scattering, and quenching to ion implantation and Rutherford backscattering and channelling. Results on self-diffusion of both metal atoms and carbon and nitrogen exist for a number of carbides and nitrides. The existing knowledge on diffusion is also summarised, with emphasis on informative examples of particular technological or scientific relevance.

Additional information

Authors: MATZKE HJ, JRC Karlsruhe (DE)
Bibliographic Reference: Extract: Defect Chemistry of Solids, Vol. 9 (1989) pp. 353-384
Availability: Elsevier Science Publishers B.V., Amsterdam (NL)
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