Preparation and characterization of CuI-doped silver borovanadate superionic system

A new cost effective glassy/crystalline superionic system xCuI–(100 − x)[2Ag2O–0.7V2O5–0.3B2O3], where x = 30, 40, 45, 50 and 60, has been prepared by melt quenching technique and the ionic transport properties were studied. The phase analysis and thermal properties of the samples carried out using XRD, FTIR and DSC techniques confirmed the glassy-crystalline composite nature of the prepared materials. DSC analyses indicated the crystallization of some phases between 130 and 170 °C and the subsequent melting of these crystallized phases in the temperature range of 200–250 °C. The room temperature electrical conductivity studies were carried out by a.c. impedance analysis. High room temperature electrical conductivity of 3.58 × 10− 3 S cm− 1 was obtained for the best conducting composition. These materials show high tAg+ value of 0.997. The use of two glass formers helped to form materials with higher Tg, higher thermal stability and better ionic transport properties.