Growth, Characterization and DC Ionic Conductivity of NaNO3:BaTiO3 Dispersed Solid Electrolyte System
In the present study, an insulating oxide BaTiO3 (<100 nm) was dispersed into a frenkel cationic conductor host NaNO3. XRD patterns of dispersed systems show the presence of peaks related to either pure NaNO3 or to BaTiO3 reveals the coexistence of two phases in the same sample. FTIR spectrum of these dispersed systems contains the absorption bands related to either pure host system or to BaTiO3, confirms the composite nature of the system. The enhancement of conductivity in BaTiO3 dispersed systems increases with m/o BaTiO3 and attains a peak at 20 m/o, followed by decrease in enhancement of conductivity. The maximum conductivity at 20 m/o is more than one order of magnitude as compared to the pure NaNO3 in the extrinsic conduction region. The enhancement of conductivity in these systems is interpreted on the basis of Wagner’s space charge model and Maier’s approach on defect chemistry.
Keywords- Solid Electrolytes, Dispersed solid electrolytes, Multi phase systems, Ionic Conductivity.