The CuI-ZnI2 system, Part I: Synthesis and ionic conductivity

Abstract

Compositions from 90 m/o CuI-10 m/o ZnI 2 to 10 m/o CuI-90 m/o ZnI 2 have been synthesized and studied with differential scanning calorimetry (DSC), X-ray diffraction at room temperature and electronic and ionic conductivity measurements (25 to ∼350°C). The compositions with ≧40 m / o CuI are solid solutions at room temperature, while disproportionation occurs in the 10 to 30 m/o CuI materials. The electrical conductivities of compositions with ≧60 m / o CuI change from mixed to ionic at ∼150°C, corresponding to DSC transitions in the same temperature region. These conductivities are higher than that of pure CuI. The highest conductivity, for 80 m/o CuI-20 m/o ZnI 2 (1.8×10 −3 ( θ cm) −1 at 250°C), is about eight times higher than that of CuI.