An Extension of Yokota’s Diffusion Theory on Mixed Conduction to Larger Applied Voltages

Abstract

In Yokota’s diffusion theory on mixed conduction, he has considered the case of small current density and obtained a solution in the linear approximation. In the present paper we consider larger current densities and look for an improved approximation over the linear one. The obtained approximate solution for larger applied voltages shows a better agreement with the numerical solution of the non-linear diffusion equation than the linear approximation. The comparison between the experiment and the calculation is done for βCu₂S and α′Ag₂Te.