Influence of the preparation conditions on the synthesis, structure and thermal properties of LaSrCo1-xMnxO4

A series of LaSrCo1-xMnxO4 (x=0.1, 0.3, 0.5) mixed oxides with a perovskite-type structure were successfully synthesized at fairly low temperatures in air by the decompositon of amorphous citric and ethylene diamine tetraacetic acid complexes. The obtained mixed oxides were characterized by means of XRD, BET, DTA, DTG, XPS analyses. The results show that the precursor can be completely decomposed into oxide at temperatures below 500?C. The decomposed species equisisted of LaSrCo1-xMnxO4 mixed oxides and formed a perovskite-type structure after calcination at 650?C for 6h. The influence of the calcination temperature on the particle size, the microstrain density and the specific surface area was much more significant than that of the calcination time. The intensity of the characteristic peak of Co2+ decresed with increasing manganese content in the LaSrCo1-xMnxO4 (x=0.1, 0.3, 0.5) mixed oxides. The binding energies of Mn 2p3/2 in the mixed oxides reveal that themanganese wasmainly in the Mn3+ state, which indicates that the influence of the calcination temperature and Mn content on the binding energies of Mn 2p3/2 was very weak.