Efeito do método de complexação combinando EDTA - citrato e coprecipitação em meio oxalato na síntese da SrCo0.8Fe0.2O3

Abstract

This work focuses on the coprecipitation synthesis method for preparation of ceramic materials with perovskite structure and characterization, developing a methodological alternative route of synthesis from the middle via oxalate coprecipitation material SrCo0.8Fe0.2O3-. In order to check the influence of this method, it was also synthesized using a combined citrate - EDTA complexing method. Both methods led to post-phase synthesis. The synthesis based on the method via oxalate coprecipitation among particles led to the crystalline phase as those obtained using a combined citrate - EDTA complexing method under the same conditions of heat treatment. The nature of the reagent used via oxalate coprecipitation method produced a material with approximately 80 % lower than the average size of crystallites. Moreover, the via oxalate coprecipitation method precursors obtained in the solid state at low temperature (26 ºC), shorter synthesis, greater thermal stability and a higher yield of around 90-95 %, maintaining the same order of magnitude the crystallite size that the combined citrate - EDTA complexing method