National Changhua University of Education Institutional Repository : Item 987654321/14211
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題名: X-ray Absorption Spectroscopy Studies of Fe-doped Misfit-layered Ca3Co4-xFexO9+δ (x = 0, 0.05, 0.1, and 0.15)
作者: Liu, Chia-Jyi;Chen, Jeng-Lung;Huang, Li-Chen;Lin, Zhi-Ru;Chang, Ching-Lin
貢獻者: 物理學系
日期: 2007
上傳時間: 2012-09-10T06:14:52Z
出版者: American Institute of Physics
摘要: We have carried out O K- and Co L2,3-edge x-ray absorption studies on misfit-layered oxides of polycrystalline Ca3Co4−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.
關聯: J. Appl. Phys., 102(1): 014908
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