Effect pH Variation of Powder Materials of the Composite Oxide Ba(x)Sr(1-x)Co(y)Fe(1-y)O3-d Obtained by Citrate-EDTA Method

Everton Bonturim; Reinaldo Azevedo Vargas; Marco Andreoli; Emília Satoshi Miyamaru Seo

doi:10.4028/www.scientific.net/MSF.727-728.764

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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Effect pH Variation of Powder Materials of the...

Effect pH Variation of Powder Materials of the Composite Oxide Ba_(x)Sr_(1-x)Co_(y)Fe_(1-y)O_3-dObtained by Citrate-EDTA Method

Abstract:

The Ba_(x)Sr_(1-x)Co_(y)Fe_(1-y)O_3-d (BSCF) powder, used with cathode in intermediated temperature solid oxide fuel cells (ITSOFCs), has been prepared by Citrate-EDTA method and calcined at 900°C for 5h. Among the parameters to be checked in a liquid phase reaction, the pH of precursor solution is very important to control the disposal of organic, crystal structure and powders morphology. In this work, precursor solution pH has been variegated 2, 4, 6 and 8. The thermal decomposition has been observed in infrared, two absorption peaks are observed at 1436 and 860 cm^-1, after calcination, corresponding to the presence of CO₃^2-, in the samples with pH 2, 6 and 8. The single phase of Perovskite crystalline structure is seen only in the synthesis at pH 4 and 6, verified by X-ray diffraction (XRD). Morphological analysis, by scanning electron microscope (SEM), shows the powder is agglomerated and has similar trend independent of precursor solution pH.