The Thermodynamic Behaviour of Nickel in a Molten LiF–KF–O2− System

Abstract

Abstract The thermodynamic behaviour of nickel in a molten LiF–KF–O2− system was investigated by using Pt(O2)/stabilized zirconia electrode as an oxide-ion-concentration indicator. The potentials of the Pt(O2)/stabilized zirconia/LiF–KF–O2− electrode and the Ni/NiO/LiF–KF–O2− electrode at 550 °C were measured as : E=2.25−\fracRT2FlnX02−(V.vs.Li-K⁄Li+,K+) and: E=1.42−\fracRT2FlnX02−(V.vs.Li-K⁄Li+,K+) respectively. The solubility product of NiO in the melt was thus determined to be Ksp=1.3×10−6 at 550 °C. With these results, a potential-pO2− diagram of the nickel in the system was presented.