By J. P. Suchet
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Extra resources for Electrical Conduction in Solid Materials. Physicochemical Bases and Possible Applications
If the metal has the electronic formula dfcs2, the crystal-formation reaction is expressed (1 -x)T dfcs2 +X s2p4 —>*DX s2p6 +(l -x)Td*'s0(p3)Xs2(P3>. Instead of the electrical neutrality condition, we shall here use the condition of invariance in the total number of electrons (d+s+p) k' = k-2xl(l-x) which will be an integer if x = 0 (kf = /c), x = J (k' = k—1), or x = £ (k' = k—2). For any other value, as for the ionic crystal, two different valencies appear, and one finds the same indices y and z.
Electron density levels in AlSb crystals (based on Sirota and Gololobov, 1964). References KREBS, H. (1968) Grundzüge der anorganischen Kristallchemie, Enke, Stuttgart (English translation, McGraw-Hill, Maidenhead). LINDBERG, G. (1952) Proc. IRE 40, 1414. MOOSER, E. and PEARSON, W. B. (1956) Report of a Meeting on Semiconductors, Rugby 1956, Physical Society, London. NEUBERGER, M. (1971) / / / V Semiconducting Compounds, IFI/Plenum, New York. PAULING, L. (1960) The Nature of the Chemical Bond, Cornell, Ithaca, NY.
1 gave successive electronic formulae for progressive filling of the d layer only in the case of an octahedral environment. It no longer applies in the case of a tetrahedral environment in which the respective positions of the two sub-levels de and dy are reversed. 2, which shows that, if A-A transfers are possible, they should be observed in the case of the ions Sc 2+ , V 2+ , Cr 2+ , Fe 2+ , Ni 2+ , and Cu 2+ . The formulae dy2a (titanium thiochromite), dy2ade3a (manganese thiochromite), and dy2ade3ady2ß (cobalt thiochromite), on the other hand, should give semiconductors by exciting, since transfers are forbidden.