Resumo

GOMEZ-CUASPUD, Jairo A.  e  VALENCIA-RIOS, Jesús S.. SYNTHESIS OF PEROVKITE TYPE OXIDES BY POLYMERIZATION WITH CITRIC AND PROPIONIC ACID. Rev.Colomb.Quim. [online]. 2009, vol.38, n.2, pp.289-302. ISSN 0120-2804.

This paper describes the preparation of La_0,75Sr_0,25Co_0,5Fe_0,5O₃ (LaSrCoFeO) perovskite, using a wet chemical route, through polymerization with citric acid and propionic acid, to obtain materials for potential applications as membranes purification materials and oxygen electrodes in Solid Oxide Fuel Cells (SOFC). The solids were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), obtaining information on the formation and purity of phases, morphology, structure and surface properties of each system. This indicates that it is possible to obtain solids with a homogeneous distribution of grain, texture and relief features. In this context the method involving the polymerization with citric acid showed the best results. The overall composition was determined by X-ray microanalysis of energy dispersive (EDX), indicating a good correlation between the compositions obtained and the proposed. The characterization performed suggests the presence of small amounts of carbon and some oxides of lanthanum, strontium and cobalt as major pollutants, specifically in the sample obtained by polymerization withpropionic.

Palavras-chave : citrates; propionates; ferroelectric; multiferroic; perovskite.

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