Electrical transport and phase stability in silver iodide—cadmium iodide

A form of the equilibrium diagram for the system AgICdI2 is proposed on the basis of thermal, X-ray diffractometer, and electrical conductivity data. Only one intermediate equilibrium phase, of composition Ag2CdI4, of tetragonal form with a0 = 6.35 Å and c0 = 12.7 Å is apparent; the previously reported hexagonal form of this composition being metastable. Low levels of CdI2 are found to enhance the formation of the cubic, γ-form, of AgI and to increase the electrical conductivity. For various levels of CdI2 inclusion in AgI, the principal increase in conductivity occurs in the region of 110 °C instead of at 146 °C as in pure AgI.