By J.P. Suchet
Crystal Chemistry and Semiconduction in Transition steel Binary Compounds.
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Extra resources for Crystal Chemistry and Semiconduction in Transition Metal Binary Compounds
8] in 1959 recalled Bradley and Hume-Rothery's rule, according to which each atom of an element in column N of the periodic table possesses 8 — N next neighbors, emphasizing that it merely expresses a tendency to complete the electron octet through the effect of covalent bonds. 3) But this equation assumes that all the valency electrons are liable to participate in Lewis pairs (the case of tetrahedral bonds of the first type of arrangement with N=YV). If only the p electrons intervene, a = N—2, and the second term is reduced to 6 (the case of pyramidal trigonal bonds of the second type of arrangement with N = V).
4]. 4. We shall return to it in the next section. Few compounds of transition metals or rare earths adopt the first type of arrangement. The main example is chalcopyrite CuFeS 2 , the structure of which is derived from B3 by alternate substitution on the metal sites. In the second type, MnO, MnS, MnSe, FeO, CoO, NiO, EuO, EuS, EuSe, and EuTe are to be found in the Bl structure, but most of the equiatomic binaries crystallize in the B8 X structure of nickel arsenide NiAs, which is derived from the preceding one by a slight distortion, and the B31 structure of MnP, which is more distorted.
10, 107 (1961). 26] C. Wagner, Z. Phys. Chem. (B) 32, 439 (1936). 27] J. H. de Boer and E. J. W. Verwey, Proc. Phys. Soc. London 49, 59 (1937). 28] J. P. Suchet, Bull. Soc. Elect. (Paris) 5, 274 (1955). 29] E. J. W. Verwey, P. W. Haayman, F. C. Romeyn and G. W. van Oosterhout, Philips Res. Rep. 5, 173 (1950). 1. 2]. 3]. There are two ways of approaching this theory which is aimed at providing a relative classification of the energy levels of d electrons: by considering the spatial distribution of point charges, which may be assumed to occupy the different sites in an ionic crystal, or by considering the symmetry and compatibility of the AOs involved.