Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ

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题名:	Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ
作者:	Liu, Chia-Jyi;Wang, Wei-Cheng;Yuan, J.-J.;Chen, Jeng-Lung;Wu, Mei-Huei;Chang, Ching-Lin
贡献者:	淡江大學物理學系
关键词:	Thermoelectric property;manganese oxide;XANES;carrier concentration
日期:	2014-01-22
上传时间:	2014-08-13 10:02:46 (UTC+8)
出版者:	New York: Springer New York LLC
摘要:	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.
關聯:	Journal of Electronic Materials 43(6), pp.2094-2098
DOI:	10.1007/s11664-013-2969-1
显示于类别:	[物理學系暨研究所] 期刊論文

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