Abstract
The kinetics and the mechanism of the reaction between silver molybdate and mercuric iodide were studied in the solid state by X-ray, chemical analysis, and electrical conductivity measurements. This is a multistep reaction where Ag 2HgI 4 is formed as an intermediate. In an equimolar mixture of Ag 2MoO 4 and HgI 2, AgI and HgMoO 4 are formed, whereas in a 1:2 molar mixture Ag 2HgI 4 and HgMoO 4 are formed. The data for lateral diffusion best fit the equationX n = kt, whereX is the product thickness, t is time, andk andn are constants. This is a multistep solid state ionic reaction initiated by the diffusion of HgI 2 molecules as such and not through counterdiffusion of cations.
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