Sol-gel Synthesis and Characterizations of MgSO4- Al2O3 Composite Solid Electrolytes

Abstract

In this study, composite solid electrolytes in the system (1-x) MgSO4 – x Al2O3 with x = 0.1 - 0.6 mole were prepared by a citric acid assisted sol-gel method. X-ray diffraction analysis confirmed the transformation of anhydrous MgSO4 to β-MgSO4 upon sintering at 900 ˚C for 2 hours. The prepared composite samples exhibited both crystalline and amorphous state of β-MgSO4. The highest conductivity found was 1.9 ×10-6 S cm-1 with x = 0.6 at elevated temperatures. The current results show that high concentration of Al2O3 enhanced the disordered phase composite sample thus contributes to high concentration amorphous of composite samples. This has been supported by FTIR, DSC and SEM.