Abstract
A generalized expression of the rate constant for solid state reactions between metallic oxides has been presented in terms of ionic transport coefficients, taking into account the interactions with electrons. The rate constant of formation of ZnAl2O4 spinel from ZnO and A12O3 was measured to bek = 97.4 exp [-360,600(J/mol)/RT] (mol ⋅ m-1 ⋅ s-1) (1503 to 1953 K). This experimental result was compared to the rate constant calculated from the tracer diffusivity of zinc, the electrical conductivity, and the transference number of zinc in the spinel. The calculated constant agrees with the measured value supporting the validity of the general expression for the formation of zinc aluminate spinel.
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