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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98557

    Title: Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ
    Authors: Liu, Chia-Jyi;Wang, Wei-Cheng;Yuan, J.-J.;Chen, Jeng-Lung;Wu, Mei-Huei;Chang, Ching-Lin
    Contributors: 淡江大學物理學系
    Keywords: Thermoelectric property;manganese oxide;XANES;carrier concentration
    Date: 2014-01-22
    Issue Date: 2014-08-13 10:02:46 (UTC+8)
    Publisher: New York: Springer New York LLC
    Abstract: We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1−x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO3−δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d–O 2p hybridization increases considerably, and unoccupied (3d–4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d–O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.
    Relation: Journal of Electronic Materials 43(6), pp.2094-2098
    DOI: 10.1007/s11664-013-2969-1
    Appears in Collections:[物理學系暨研究所] 期刊論文

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