X-ray absorption spectroscopy studies of Fe-doped misfit-layered Ca3Co4-xFexO9+δ (x = 0, 0.05, 0.1, and 0.15)
學年 95
學期 2
出版(發表)日期 2007-07-01
作品名稱 X-ray absorption spectroscopy studies of Fe-doped misfit-layered Ca3Co4-xFexO9+δ (x = 0, 0.05, 0.1, and 0.15)
作品名稱(其他語言)
著者 張經霖; Chang, C. L.; Liu, Chia-jyi; Chen, Jeng-lung; Huang, Li-chen; Lin, Zhi-ru; Chang, Ching-lin
單位 淡江大學物理學系
出版者 American Institute of Physics (AIP)
著錄名稱、卷期、頁數 Journal of Applied Physics 102(1), pp.014908
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+ 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+. 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.
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ISSN 0021-8979
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