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The Journal of Argentine Chemical Society

versão On-line ISSN 1852-1428


CORDOBA, Lucrecia M.; GOMEZ, María Inés; DE MORAN, Juana A.  e  AYMONINO, Pedro J.. Synthesis of the SrFeO2.5 and BaFeO3-x perovskites by thermal decomposition of SrNH4[Fe(CN)6] 3H2O and BaNH4[Fe(CN)6]. J. Argent. Chem. Soc. [online]. 2008, vol.96, n.1-2, pp.1-12. ISSN 1852-1428.

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.

Palavras-chave : Thermal decomposition; Hexacyanoferrates (III); Perovskites; Thermoanalytical studies.

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