Abstract
Experimental investigations concerning the preparation and characterisation of the system CuI-Ag 2MoO 4 have been undertaken with a view to evaluate the transport properties of the mixed system and to identify the fast ion conducting compositions. Powder samples of various compositions containing 45, 50, 55, 60, 65, 70, 75, 80 and 90 mol% Ag 2MoO 4 were synthesized by melting process. Samples were analysed using powder X-ray diffraction (XRD) and differential scanning calorimetry (DSC) techniques in order to determine their crystal structure and phase transition temperatures. These studies have revealed the formation of new substances having phase transition temperatures similar to that of AgI. Detailed complex impedance measurements carried out in the frequency range 65.5 kHz-1 Hz and over the temperature range 293–393 K have identified the best conducting composition namely 45m/o CuI-55m/o Ag 2MoO 4, exhibiting an electrical conductivity of 2.36×10 −3S cm −1 at 303 K and an activation energy of 0.21 eV for Ag + ion migration within the solid. The occurrence of fast ion transport due to silver ion migration in several compositions of the above mixed system has been explained on the basis of “hard and soft acids and bases” principle and ion exchange chemistry.
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