Li1+δMn2-δO4 were synthesized by citric acid gel process using lithium acetate and manganese acetate as the sources of lithium and manganese. Spinel Li1+δMn2-δO4 had been synthesized at various temperatures from 200 to 500°C and the synthesis mechanism was examined by thermal and structural analysis. Li1+δMn2-δO4 can be synthesized as low as 200°C is attributed to the short distance between lithium and manganese formed in precursor prepared by citric acid gel process. Thus, lithium and manganese could react each other and form the desired compound at low temperatures. The lattice parameter of powders increased with increasing temperature from 8.136 Å at 200°C to 8.211 Å at 500°C. The specific surface area of sample calcined at 200°C was 160 m2/g and deceased with calcination temperature increasing. From the SEM studies, the powder prepared at 200°C showed porous structure due to the liberation of CO2 and H2O from the decomposition of organic material. The particle size of powder calcined at 300°C for 24 h in the range of 60 to 85 nm. The powder synthesized by citric acid gel process showed circular shape and did coarsen significantly with the calcination temperature increased.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry