DC Ionic Conductivity Study by Two Probe Method on (1-X)Pb(NO_3)_2:XCeO_2 Composite Solid Electrolyte

摘要

Lead Nitrate composite solid electrolyte system in different compositions was synthesized by dispersing nano particles of CeO_2 in the host Pb(NO_3)_2. These systems were characterized by XRD, DSC and FTIR. X-ray diffraction patterns have shown peaks corresponding to pure lead nitrate and cerium oxide in all the compositions with varying intensities and no additional or shifting of peaks were observed. DSC studies indicate uniform melting point in host and dispersed composites. FTIR studies ruled out the chemical reaction between host and dispersoid. Dc ionic conductivity studies were carried out in the temperature range 100℃ to 400℃. Ionic conductivity was found to increase with mole percentage of the dispersoid with increase in temperature. Maximum enhancement was observed for 8mole% dispersed system as against the pure Pb(NO_3)_2 in the extrinsic region of conductivity. Enhanced conductivity in dispersed systems was thought to be due to the presence of Space Charge Layer between the host and dispersoid.