Abstract
Crystalline multiferroic BiFeO3 powders were directly synthesized by sol-gel auto-combustion method. The gels, derived from the solutions of 2-methoxyethane, metal nitrate and citric acid, exhibited the self-propagating combustion behaviors at ambient temperature when it is ignited in air. After auto-combustion, the dried gels transformed into crystalline BiFeO3 powders and no further calcination was needed. The nature of auto-combustion was ascribed to heat-induced redox between NH4NO3 and carboxyl group. The TG-DTA was carried out to study the auto-combustion of dried gels. The synthesized powders were characterized by XRD and SEM techniques.
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