Akademik Veri Yönetim Sistemi
Materials Chemistry and Physics, cilt.355, 2026 (SCI-Expanded, Scopus)
Strontium cobaltite (SrCoO3-δ) is a promising material that used as a cathode material in solid oxide fuel cells by changing its physical and chemical properties by adding various elements to the cation sites. In this paper, chemical co-precipitation technique providing high homogeneity was applied in the synthesis of nanopowder strontium cobaltite containing equimolar amounts of Sr and Co. Ammonium oxalate monohydrate ((NH4)2C2O4·H2O) was used as precipitating agent. Formation mechanism was revealed in the light of characterization of intermediate products and final product, thermal analysis of the precursor. SrC2O4·H2O and CoC2O4·2H2O were obtained by precipitation of Sr(NO3)2 and Co(NO3)2·6H2O. The mixture of oxalates was heated to critical temperatures to obtain intermediate products and strontium cobaltite. TG/DTA-MS, ICP-OES, XRD, FT-IR and SEM analytical techniques were used for the characterization of intermediate and final products. In the range of 914-1219 K, SrO, the decomposition product of SrC2O4·H2O, and Co3O4, the decomposition product of CoC2O4·2H2O, react to form Sr6Co5O15-β. Sr6Co5O15-β reacts with Co3O4 present in the medium to form strontium cobaltite containing equimolar ratios of Sr and Co (Sr2Co2O5-δ) at 1185 K. Oxygen stoichiometry of strontium cobaltite formed at 1373 K temperatures were calculated as SrCoO2.41. The crystallite sizes of the final product strontium cobaltite samples were 29 and 44 nm. The microstructure of the obtained nanopowder strontium cobaltite is suitable for electrochemical applications.