Abstract
Abstract In order to elucidate the kinetics of selenization of silver by liquid selenium, the Ag/Ag2Se interface reaction rate, the ionic conductivity of Ag+ in Ag2Se layer, the Ag2Se/Se(1) interface reaction rate, and the over-all reaction rate were determined. The Ag/Ag2Se interface reaction rate was found to be given by υ=1.6×10^9{exp(-32300/RT)}(a_Se) eqv cm^-2·s^-1 The following mechanism was proposed for the interface reaction. 2Ag(Ag)+Se(Ag_2Se)→2Ag^+(Ag_2Se)+Se^2-(Ag_2Se) It was found that the driving force of the Ag2Se/Se(1) interface reaction is very small and Ag2Se is in equilibrium with Se(1). On an assumption that the over-all reaction is controlled by both the Ag/Ag2Se interface reaction and the diffusion of Ag+ in Ag2Se, the over-all reaction rates were calculated. The results agree with the observed ones.
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