Synthesis of the SrFeO2.5 and BaFeO3-x perovskites by thermal decomposition of SrNH4[Fe(CN)6] 3H2O and BaNH4[Fe(CN)6]

in the present work the synthesis, physicochemical characterization and thermoanalytical results of srnh4[fe(cn)6]3h2o y banh4[fe(cn)6] are described. the thermal decompositions in oxygen atmosphere for both salts are carried out in the stages that lead to the formation of mixed oxides, i. e., srfeo2.5 and bafeo3-x at 1173 k. barium carbonate is also obtained in the residue in the case of the decomposition of the barium complex. the total weight loss are 49,95% and 35,45 % for the strontium and barium salts, respectively. a decomposition mechanism is suggested for the pyrolisis processes from the data provided by ir spectroscopy, x-ray powder diffraction and chemical analysis. the specific surface area of the obtained oxides is also determined in order to evaluate its eventual catalytic activity.