Premium
Crystal Chemistry of Complex Carbides and Related Compounds
Author(s) -
Nowotny Hans
Publication year - 1972
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.197209061
Subject(s) - carbide , crystallography , crystal structure , octahedron , transition metal , materials science , crystal chemistry , group (periodic table) , trigonal prismatic molecular geometry , lattice (music) , metal , chemistry , metallurgy , physics , catalysis , organic chemistry , biochemistry , acoustics
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 [M 6 C] groups (M = transition element). From this point of view perovskite carbides (M 3 M′C, M′ = another transition or A‐group element) and derivatives, β‐Mn carbides (M 3 M′ 2 C), κ‐carbides, carbides with V 3 AsC‐ and Cr 2 AlC type structures and derivatives, η‐carbides (M 3 M′ 3 C) and carbides having the filled Mn 5 Si 3 type structure will be treated. The high stability of these complex carbides is due to the strong bonding MC and additional bonding of MM′ 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.