Abstract
Perovskite oxide La 1– x Sr x CoO 3 (0≤ x≤0.5) series were prepared and effect of oxygen annealing on crystal structure and magnetic susceptibility were studied. High-temperature susceptibility could be well fitted by Curie-Weiss law for all Sr-doped samples. Weiss constant and effective magnetic moment were determined, and their variations with Sr doping and oxygen annealing condition were obtained. The result suggested that by assuming that the Co 3+ ions were in the intermediate-spin (IS) state, most of the Co 4+ ions in the as-prepared samples might be in the high-spin (HS) state, but both the Co 3+ and Co 4+ ions might be in the IS state after oxygen annealing, which indicated that annealing in flowing oxygen could cause transition of the spin state of Co 4+ ions from the HS state to IS state.
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