Effect of pH value on ionic state of iron in double perovskite Sr2FeCoO6 synthesised by gel-combustion method

다국어 초록 (Multilingual Abstract)

The double perovskite Sr2FeCoO6 oxide powder has been prepared by nitrate-citrate gel-combustion process for different ratios of citric acid and metals under various pH values and calcined at 700 o C for the complete decomposition of the carbonaceous residues. The effect of pH on crystal development and ionic state of iron has been determined by X-ray diffraction and Mössbauer spectroscopic studies. The analysis revealed that calcinated powder is a single phase cubic perveoskite structure SrFe0.5Co0.5O3 with space group Pm3m and lattice parameter 3.867 Å. Mössbauer spectroscopic results indicate that as-synthesized and calcined samples have mixed ionic states like Fe3+, Fe3.5+ and Fe4+ in the tetrahedral framework of SrFe0.5Co0.5O3.

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