Henrian ideality of iron in liquid uranium solvent at high temperatures

Abstract

Equilibrium vapor pressures of iron from its dilute solutions in liquid uranium were measured at high temperatures (2250–2750 K). From the Fe vapor pressure data at known compositions ( x Fe), Henry’s coefficient ( K Fe= p Fe/ x Fe) of the solute was obtained as log K Fe (±0.07) (Pa)=−18975.6(±1098.1)/T+11.15(±0.44) . The behavior of K Fe( T) is shown to be marginally different from that of the equilibrium vapor pressures of pure liquid iron ( p Fe°). The partial molar excess Gibbs energy of iron at infinite dilution derived from the behavior is expressed as Δ E G ̄ Fe ∞=−1588+1.25T ( J mol −1) . The result is discussed in the light of the quasi-regular solution model and compared with data of the system available in the literature.