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    Title: X-ray absorption spectroscopy studies of Fe-doped misfit-layered Ca3Co4-xFexO9+δ (x = 0, 0.05, 0.1, and 0.15)
    Authors: 張經霖;Chang, C. L.;Liu, Chia-jyi;Chen, Jeng-lung;Huang, Li-chen;Lin, Zhi-ru;Chang, Ching-lin
    Contributors: 淡江大學物理學系
    Date: 2007-07-01
    Issue Date: 2009-12-31 10:15:04 (UTC+8)
    Publisher: American Institute of Physics (AIP)
    Abstract: We have carried out O K- and Co L2,3-edge x-rayabsorption studies on misfit-layered oxides of polycrystallineCa3Co4−xFexO9+δ (x=0,0.05,0.1,0.15). The analyses of integrated absorption intensity show that the number of Co 3d unoccupied states decreases upon partial substitution of Fe for Co, which correlates well the variation trend of the room-temperature resistivity with x. Nevertheless, the number of O 2p unoccupied states increases with x. Both Hall and thermopower measurements indicate that the majority carrier is of hole type for Ca3Co4−xFexO9+δ. Therefore, the decrease of O 2p occupancy should be responsible for the increase of the hole carrier concentration upon partial substitution of Fe for Co.
    Relation: Journal of Applied Physics 102(1), pp.014908
    DOI: 10.1063/1.2748722
    Appears in Collections:[物理學系暨研究所] 期刊論文

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