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Title: Effect of Mn Doping on the Physical Properties of Misfit-layered Ca3Co4O9+δ
Authors: Chen, J. L.;Liu, Y. S.;Liu, Chia-Jyi;Huang, L. C.;Dong, C. L.;Chen, S. S.;Chang, C. L.
Contributors: 物理學系
Date: 2009
Issue Date: 2012-09-10T06:15:49Z
Publisher: IOP Publishing
Abstract: 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.
Relation: J. Phys. D: Appl. Phys., 42(13): 135418
Appears in Collections:[物理學系] 期刊論文

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