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- W2008593559 abstract "Abstract The two-correlations model for the bonding classification (binding) in metallic phases is applied to transition metal disilicides. The model considers the spatial correlations of the valence electrons ( b correlation) and of the peripheral core electrons ( c correlation) and proposes them to be simply commensurable to the crystal structure and to one another. A better understanding of the disilicides is possible by using the assumption that the electron contribution into the b and c correlations is essentially T 0, n Si 4,8 2 , where T represents a transition metal atom and n is its column number in the periodic system of elements. From this electron contribution it follows that the valence electron concentration in all T n Si 2 phases is nearly the same (i.e., not regarding a descent of valence electrons into the c correlation), and that the core electron concentration is not varying rapidly during increase of the column number n of the T component. Therefore the structure types of TiSi 2 , CrSi 2 , and MoSi 2 are homeotypic and the stacking-homeotypism is caused by the increase of the core electron concentration. For n = 7 defect disilicide structures occur and an FU2 binding becomes stable, which is the cause for the incommensurability in one direction of the T and Si partial structures. The T atoms choose positions compatible with the c correlation and the B atoms adapt their position to the b correlation, since these component atoms mainly contribute into these separate correlations. For n = 8 the descent of valence electrons is reduced in quantity so that the binding becomes of the FB2 type which is formed in FeSi 2 .r, CoSi 2 , and NiSi 2 . The phase FeSi 2 .r is heterotypic to CoSi 2 as the commensurability of the FB2 binding to the cell is different in both phases." @default.
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- W2008593559 date "1982-06-01" @default.
- W2008593559 modified "2023-09-27" @default.
- W2008593559 title "On the binding in transition metal disilicides" @default.
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- W2008593559 doi "https://doi.org/10.1016/0022-4596(82)90219-5" @default.
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