Experimental results are presented for the ionic conductivity of AgI1−xClx (0 < x < 0.1) in the temperature range 60 to 200 °C. It is found that the substitution of Cl− ions for I− ions in AgI leads to a substantial decrease in the temperature for β–α phase transition and also a large increase in the ionic conductivity in β‐phase. The effect of Cl− ions is more pronounced than that of Br− ions. This result is consistent with Shahi and Wagner's conjecture. A simple model is given which can explain the effect of Cl− ions.

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