When the data are presented in terms of an effective electron-atom ratio, there is an apparent shift in the position of the peak of the curve to a value iV e ff less than 4.7, probably close to 4.4, for the V-Ti system; and an apparent shift in the peak from 6.4 to 6.6 for the Mo-Re system. The physical significance of this is not clear.The influence of effective valence on resistivity of some of these transition-metal alloys has already been cited. 15 SUMMARY 1. The change in electron-atom ratio iV e ff, which includes a solute size correction to determine an effective valence of the solute in a transition-metal matrix such as niobium, reveals a linear relationship with T c for dilute alloys of niobium with transition-metal solutes selected from columns 4 through 10 of the periodic table.2. For transition-metal alloys of columns 4 and 5 and 38 C.
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