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Direct Cation-Cation Interactions in Primarily Ionic Solids
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DOI：10.1063/1.1984748.png)
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It is pointed out that there is considerable experimental evidence for direct cation-cation interactions in several primarily ionic solids containing transition-element cations with outer-electron configuration ndm,where m≤5. Competitive indirect (cation-anion-cation) interactions are dominant if m = 5. Nevertheless, if cation-occupied octahedra share a common face, as in the corundum and NiAs-type structures, the direct(cation-cation) interactions may also significantly influence the physical properties of the material. If octahedral-site cations have m≤3, the cation-anion-cation interactions are weak and cation- -cation interactionsmay be dominant. The consequences of cation- -cation interactions are described and shown to be quite distinct from those of cation-anion-cation interactions so that the dominant mechanism can usually be distinguished. Data for several illustrative materials are presented.
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