Interdiffusion in CoO‐NiO Solid Solutions

Abstract

Interdiffusion coefficients were measured in CoO‐NiO solid solutions over the range 1000° to 1600°C in air and at po 2 =5×10 −8 atm. Isothermal values of the interdiffusion coefficients in this system increased exponentially with the CoO concentration. Comparison of the present results with cation‐tracer diffusion coefficients for this system measured under similar conditions by Chen and Peterson shows that a Darken‐type equation relating the interdiffusion coefficient to the cation‐tracer diffusivities is valid for these data.