Abstract: Synthesis, characterization, electrical and dielectrical properties have been made in nanostructured components of _0.19Ba(NO₃)₂-_0.81KNO₃: Al₂O₃, _0.19Ba(NO₃)₂-_0.81KNO₃: SiO_{2, 0.19}Ba(NO₃)₂-_0.81KNO₃: CeO₂ solid electrolyte systems. The system _0.19Ba(NO₃)₂-_0.81KNO₃ with 1.1, 5.3, 10.8 and 20 mole percentages of Al₂O₃ (1000, 300 and 60 nm), SiO₂ (20 nm) and CeO₂ (10 nm) have been characterized through X-ray diffraction, DSC and SEM. The electrical and dielectrical properties of these materials have shown an increase in conductivity as the temperature rises from room temperature to almost melting point of pure system. The enhancement of ionic conductivity observed to an increase with m/o and reaches to maximum at 10.8 m/o for Al₂O₃ (1000 nm), 10.8 m/o for Al₂O₃ (300 nm), 5.3 m/o for Al₂O₃ (60 nm), 10.8 m/o for SiO₂ (20 nm) and 10.8 m/o for CeO₂ (10 nm) mole percentages followed by a fall of conductivity with further increase of dispersion to the host material. X-ray diffraction patterns of pure mixed system _0.19Ba(NO₃)₂-_0.81KNO₃ and 1.1, 5.3, 10.8 and 20 m/o dispersed systems have shown that pure phases of host and dispersoid materials coexist in the dispersed systems indicating that there is no chemical reaction between them. The enhancement of conductivity in these systemsis explained as due to the increased concentration of defects in space charge region formed between the host and nano particles of dispersoid. The optimized nanoceria added to _0.19Ba(NO₃)₂-_0.81KNO₃ is considered to give the best performance for application in the solid oxide fuel cells.