Electrical conductivity and thermodynamic properties of liquid Na3+δSb alloys

Abstract

AbstractThe melting point of the intermetallic compound Na3Sb was measured and found to be 1015°C. Partial molar Gibbs energies of Na in liquid NaSb alloys were determined at 1030°C for alloy compositions between xNa = 0.71 and xNa = 0.78 using an emf technique employing CaF2 as a solid electrolyte. A special cell design was used and is described in detail. The electrical conductivity of NaSb alloys was also measured at 1030°C over a composition range from xNa = 0.71 to xNa = 0.77. A sealed cell was used for these measurements where the composition of the alloy is accurately controlled by coulometric titration. Results showed that the alloys are liquid semiconductors. The thermodynamic and electrical properties are quantitatively explained by a model previously proposed by Carl Wagner, and pertinent equations are given. The correspondence with the predictions of electrical transport in disordered liquid semiconductors is discussed.