Influence of carboxylic acid type on microstructure and magnetic properties of polymeric complex sol-gel driven NiFe 2 O 4

摘要: Abstract Citric, oxalic and tartaric acids were used for synthesis of NiFe2O4 using polymeric complex precursor route. The dry gels calcined at various temperatures (400–1100 °C) 2 h. All carboxylic produce iron-deficient with considerable amount α-Fe2O3 400 °C. Increase in the annealing temperature caused reaction ferrite phase. initially formed is directly correlated stability constant inversely decomposition Fe(III) carboxylate precursors. In case acid precursor, single phase was obtained 450 °C. However, citric precursors, 550 °C 700 °C, respectively. lattice parameters increased increasing decreasing α-Fe2O3. Maximum saturation magnetization (55 emu/g) achieved annealed 1100 °C.