| Abstract: | Numerous metal carbides can be discussed in a rather uniform way by means of structural features, mainly characterized by the mode of linking of octahedral and occasionally trigonal prismatic M6C] groups (M = transition element). From this point of view perovskite carbides (M3M′C, M′ = another transition or A-group element) and derivatives, β-Mn carbides (M3M′2C), κ-carbides, carbides with V3AsC- and Cr2AlC type structures and derivatives, η-carbides (M3M′3C) and carbides having the filled Mn5Si3 type structure will be treated. The high stability of these complex carbides is due to the strong bonding M? C and additional bonding of M? M′ atoms forming an ordered parent lattice. Besides the interstitial principle of filling of lattice holes (by isolated carbon atoms), substitution with A-group elements may also take place. Thus in borocarbides extended structural elements occur. |
