Influence of annealing on spin state of cobalt ions inLa1-xSrxCoO3 (0≤x≤0.5) system
来源期刊：JOURNAL OF RARE EARTHS2009年第1期
论文作者：JIANG Lizhen XU Zhuan
Key words：La1-xSrxCoO3; oxygen annealing; magnetic susceptibility; spin state; rare earths;
Abstract: Perovskite oxide La1-xSrxCoO3 (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 Co3+ ions were in the intermediate-spin (IS) state, most of the Co4+ ions in the as-prepared samples might be in the high-spin (HS) state, but both the Co3+ and Co4+ 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 Co4+ ions from the HS state to IS state.
JIANG Lizhen1，XU Zhuan2
(1.College of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;
2.Department of Physics Zhejiang University Hangzhou 310027 China)
Abstract:Perovskite oxide La1-xSrxCoO3 (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 Co3+ ions were in the intermediate-spin (IS) state, most of the Co4+ ions in the as-prepared samples might be in the high-spin (HS) state, but both the Co3+ and Co4+ 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 Co4+ ions from the HS state to IS state.
Key words:La1-xSrxCoO3; oxygen annealing; magnetic susceptibility; spin state; rare earths;
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