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The diffusion and electromigration of Ag in crystals of CdxHg1-xTe is studied, as a function of original doping level and of the concentration of mercury. In materials with x = 0.55-0.8, Ag dopes p-type, when diffusing in at <125°C. This should be contrasted to what is found in n-CdTe, where in-diffusion of Ag at 200°C increases the net donor density, leaving the material n-type. Our results show...