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    题名: Effect of Mn doping on the physical properties of misfit-layered Ca3Co4O9+δ
    作者: Chen, J L;Liu, Y S;Liu, Chia-Jyi;Huang, L-C;Dong, C L;Chen, S S;Chang, C L
    贡献者: 淡江大學物理學系
    日期: 2009-07
    上传时间: 2011-10-24 11:08:30 (UTC+8)
    摘要: We have carried out an x-ray absorption near-edge structure (XANES) study on a series of misfit-layered cobaltites Ca3Co4−xMnxO9+δ (x = 0, 0.05, 0.1, 0.15). In this system, the average valences of Co and Mn, according to Co and Mn K-edge measurements are about 3.50+ and 3+, respectively. Both the trivalent and tetravalent Co are of low-spin configurations as confirmed by our magnetization measurements. The variations of absorption intensities of Co L2,3-edge and O K-edge XANES with respect to the Mn doping concentration (x) are analysed. Co L2,3-edge results show that the Co 3d unoccupied states decrease with x, which correlate well with the trend of variation of thermoelectric power. O K-edge results indicate that the number of O 2p unoccupied states decreases with x, which implies a decrease in the majority charge carriers (hole) concentration upon partial substitution of Mn for Co.
    關聯: Journal of Physics D: Applied Physics 42(13), 135418(5pages)
    DOI: 10.1088/0022-3727/42/13/135418
    显示于类别:[物理學系暨研究所] 期刊論文


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