Abstract
The thermodynamic activities of iron in iron-nickel alloys have been determined by e.m.f. measurements on solid-electrolyte oxygen concentration cells over the temperature range 750°∼1150°C.The activity of iron in the alloy system exhibits slightly positive departures from ideal solution behavior in iron-rich alloys and negative departures in nickel-rich alloys. The activities of nickel, deduced from the Gibbs-Duhem equation, indicate negative departures from ideality in all compositions.The relative integral molar excess entropies are positive for all the composition studied. However, consideration of magnetic factors suggests that the configurational excess entropies are negative and that the solid solutions are non-random.The heats of mixing vary from endothermic values to exothermic values with increasing nickel content; inferring that the non-random behavior suggested by the presumed configurational excess entropies is clustering at iron-rich compositions and short-range ordering at nickel-rich compositions.
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