Subramanian, A. and Saradha, T. and Muzhumathi, S. (2007) Synthesis of nano-crystalline (Ba0.5Sr0.5)Co0.8Fe0.2O3−δ cathode material by a novel sol–gel thermolysis process for IT-SOFCs. Journal of Power Sources, 165. pp. 728-732.

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Abstract

Nano-crystalline (Ba0.5Sr0.5)Co0.8Fe0.2O3−δ powder has been successfully synthesized by a novel sol–gel thermolysis method using a unique combination of PVA and urea. The decomposition and crystallization behaviour of the gel precursor was studied by TG/DTA analysis. The gel precursor was calcined at different temperatures and the phase evoluation was studied by X-ray diffraction (XRD) analysis. From the result of X-ray diffraction patterns, it is found that a cubic perovskite (Ba0.5Sr0.5)Co0.8Fe0.2O3−δ was formed by calcining the precursor at 450 ◦C for 5 h, but the well-crystalline cubic perovskite (Ba0.5Sr0.5)Co0.8Fe0.2O3−δ was obtained by calcining the precursor at 650 ◦C for 5 h. Morphological analysis of the powder calcined at various temperatures was done by scanning electron microscope (SEM). Thermogravimetric (TG) results showed the lattice oxygen loss of the product was about ∼2% in its original weight in the temperature range 40–900 ◦C. Finally, thermal expansion and electrical conductivity of the synthesized material were measured by dilatometer and four-probe dc method, respectively.

Item Type:	Article
Uncontrolled Keywords:	(Ba0.5Sr0.5)Co0.8Fe0.2O3−δ; Sol–gel thermolysis process; Nano-crystalline powder; IT-SOFC cathode material
Subjects:	Fuel Cells
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	28 Feb 2012 15:13
Last Modified:	28 Feb 2012 15:13
URI:	http://cecri.csircentral.net/id/eprint/792

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