The diffusion and solubility of oxygen in solid nickel

Solid-state electrochemical measurements using various experimental procedures were made with the double cell: $$ Ni + NiO|ZrO_2 + Y_2 O_3 |Ni + underline O |ZrO_2 + Y_2 O_3 |Ni + NiO $$ to determine the diffusivity and thermodynamic functions of oxygen dissolved in solid nickel. Non-steady state diffusion of oxygen in the specimen was caused by applying a preselected potential between the reference and specimen electrodes and was monitored by measuring time-dependent potentials and/or currents. The following results were obtained for the diffusivity of oxygen and the solubility of oxygen in nickel in equilibrium with NiO: $$D{text{ = 4}}{text{.9 }} times {text{ 10}}^{{text{ - 2}}} {text{ exp}}left( {{text{ - }}frac{{{text{164 kJ/mole}}}}{{{text{R}}T}}} right){text{cm}}^{text{2}} /{text{sec (850 to 1400 }}{}^{text{o}}{text{C)}}$$ $$C_{text{O}}^s {text{ = 8}}{text{.3 exp}}left( { - frac{{55{text{kJ/mole}}}}{{{text{R}}T}}} right){text{at}}{text{. pct (800 to 1000 }}{}^{text{o}}{text{C)}}$$ The thermodynamic and transport behaviors of oxygen in solid nickel were fairly well described by a simple quasi-regular model and an interstitial diffusion model, respectively.