Abstract: A series of YBaCo₄O_{7+ ○δ○} oxygen carriers were synthesized by solid state reaction method and sol-gel method with different preparation parameters. The phase composition of the samples were analyzed by X-ray diffraction. The effects of preparation parameters on the oxygen storage capacity of Y114 phase at medium and low temperature were investigated by means of thermogravimetry. The experimental results show that the oxygen storage capacity of Y114 phase prepared by the solid state reaction method is higher than that of the one prepared by sol-gel method and the Y114 phase calcined for 20h has a better performance. The δ (nonstoichiometric oxygen) of Y114 phase is 0.89， where the sample is synthesized by the solid state reaction method， calcined at 1150℃ for 20h and furnace cooling， while the δ becomes 0.83 where it is synthesized by the sol-gel method， calcined at 1050℃ for 20h and cooled in air.

Key words: preparation parameters, Y114 phase oxygen carriers, phase composition, oxygen storage capacity, nonstoichiometry oxygen