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Oxygen stoichiometry of Basub(0.50)Srsub(0.50)Cosub(0.80)Fesub(0.20)Osub(3-'delta') obtained by EDTA-citrate method and measured by X-ray and neutron diffraction
2015 - BONTURIM, EVERTON; MAZZOCCHI, VERA L.; PARENTE, CARLOS B.R.; MESTNIK FILHO, JOSE; LIMA, NELSON B. de; SEO, EMILIA S.M.
The compound Ba0.50Sr0.50Co0.80Fe0.20O3–d (BSCF) has been used as a good candidate for air electrodes in Intermediate Temperature Solid Oxide Fuel Cells. Present work deals with the oxygen vacancy of this compound synthesized by using the EDTA–Citrate method. To obtain a single-phase sample, three portions of the compound were calcined at 700, 800 and 900 C. Only the sample calcined at 900 C showed a single phase. The stoichiometry of the single-phase sample, in particular of the oxygen atom, was determined by applying the combined X-ray and neutron Rietveld refinement to X-ray and neutron powder diffraction patterns measured with the sample.