Abstract
The activity of a very dilute interstitial component is proportional to the ratio of filled to unfilled interstitial sites. In a liquid solution in which solvent and solute atoms are strongly bonded to form in effect molecules of a soluteABb, each solvent atom is regarded as providingb sites forB atoms. The activity of the solute and other properties of the solution are treated by the same equations as those describing the interstitial solution. Concentrations are stated in terms of the ratiosyi = ni/(n1 +n2) where components 1 and 2 are lattice atoms andi represents any component. The activity coefficient of the interstitial component is defined as Ϋ3 =a3/z3 where z3 = Y3J(1 —y3/b). Henry’s law for the solute at great dilution is Ϋ3 = constant. Examples are cited in which log Ϋ3 is a linear function ofy3 or in other cases ofz3. A simple form of the Gibbs-Duhem relation for ternary solutions is used to deduce the effects of an interstitial solute on the activities of the individual lattice components.
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