Akademik Veri Yönetim Sistemi
Thermochimica Acta, cilt.676, ss.52-63, 2019 (SCI-Expanded)
© 2019 Elsevier B.V. Strontium cobaltite was produced by heating the mixture containing equimolar amounts of Sr(NO 3 ) 2 and Co(NO 3 ) 2 ∙6H 2 O under dynamic air atmosphere. The reactions occurred during heating were determined and the intermediate and final products obtained at each reaction step were characterized using TG/DTA-MS, ICP-OES, XRD and FT-IR techniques. The oxygen stoichiometry of strontium cobaltite was determined using iodometric titration method and carbonation process. It was determined by thermal analysis results that Co(NO 3 ) 2 ∙6H 2 O was decomposed to CoO by forming the intermediate products Co(NO 3 ) 2 ∙4H 2 O, Co(NO 3 ) 2 ∙2H 2 O, Co(NO 3 ) 2 ∙H 2 O, Co(NO 3 ) 2 , CoOOH, Co 2 O 3 and Co 3 O 4 . Sr(NO 3 ) 2 was decomposed to SrO. Sr 6 Co 5 O 15 was formed by solid state reaction of SrO, Co 3 O 4 and O 2 . Sr 2 Co 2 O 5 was produced at elevated temperatures from Sr 6 Co 5 O 15 and Co 3 O 4 . Analyses carried out for the characterization of compounds obtained at different isothermal conditions showed that final product Sr 2 Co 2 O 5 was obtained via Sr 14 Co 11 O 33 and Sr 6 Co 5 O 15 . Sr 2 Co 2 O 5 was decomposed to a mixture of Sr 6 Co 5 O 15 and Co 3 O 4 with a mole ratio of 1: 0.333 during slow cooling to the room temperature.