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Información tecnológica

On-line version ISSN 0718-0764


DOS SANTOS, Andarair G; FONTES, Francisco A. O; DE SOUSA, João F  and  DE SOUZA, Carlson P. Synthesis and Refining by Rietveld Method of the perovskite phase obtained using Oxalate Co-precipitation Method. Inf. tecnol. [online]. 2011, vol.22, n.1, pp.17-28. ISSN 0718-0764.

Powders of perovskite SrCo0.8Fe0.2O3-δ were synthesized using oxalate co-precipitation method. According to the thermal gravimetry and differential thermal analysis (TG/DTA), total mass loss was 40 % corresponding to three different steps and the precipitant agent as well the starting chemical elements have no influence on the process. Perovskite phase was identified by x-ray diffraction and the average crystallite size was 77.22 nm using ¡ron nitrate (III) as starting material while 42.23 nm were obtained using ¡ron oxalate (III). Ammonium oxalate and equimolar mixtures of ammonium oxalate and oxalic acid were used as precipitant agents and the results shown that these reactants have no influence on the average crystallite size (42.95 nm and 42.23 nm). The material presents isotherms of type II, with especific surface of approximately 4,41 m2g-1.

Keywords : perovskite; co-precipitation method; oxalate; refining Rietveld method.

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