出版日期：2014-01-22 00:00:00

著者：Liu, Chia-Jyi; Wang, Wei-Cheng; Yuan, J.-J.; Chen, Jeng-Lung; Wu, Mei-Huei; Chang, Ching-Lin

單位：淡江大學物理學系

出版者：New York: Springer New York LLC

著錄名稱、卷期、頁數：Journal of Electronic Materials 43(6), pp.2094-2098

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.

關鍵字：Thermoelectric property;manganese oxide;XANES;carrier concentration

語言：en_US

ISSN：1543-186X

期刊性質：國外

收錄於：SCI

審稿制度：否

國別：USA

出版型式：電子版,紙本