High Temperature Thermoelectric Response of Electron-Doped CaMnO(3)

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	High Temperature Thermoelectric Response of Electron-Doped CaMnO(3)
	Y. Wang; Y. Sui; H. J. Fan; X. J. Wang; Y. T. Su; W. H. Su; X. Y. Liu
	2009
发表期刊	Chemistry of Materials
ISSN	0897-4756
卷号	21 期号:19 页码:4653-4660
摘要	We report a systematical investigation on the high temperature thermoelectric response of Ca(1-x)R(x)MnO(3) (R = rare-earth) perovskites in the electron-doped range. The results reveal that electron concentration is the dominant factor for the high temperature electrical transport properties whereas the weight and size of R ions dominate the thermal transport properties. As the doping level varies, the best thermoelectric performance is observed at the relative electron concentration around 0.1. However, in the case of a fixed electron concentration, structural distortions become important since bandwidth has an observable influence on resistivity. By combining the three factors, electron concentration, crystal structure, and the weight/size of R ions, the largest thermoelectric figure of merit ZT for Ca(1-x)R(x)MnO(3) reaches 0.2 at 1000 K. But this ZT value is still too far from the application criterion (ZT > 1). Using the dynamical mean field theory, we demonstrate that a ZT value larger than one in electron-doped CaMnO(3) systems seems rather unlikely. Some strategies for searching new thermoelectric materials with high performance in transition metal oxides are proposed.
部门归属	[wang, yang; sui, yu; wang, xianjie; su, yantao; su, wenhui] harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china. [sui, yu] acad sinica, int ctr mat phys, shenyang 110015, peoples r china. [wang, yang; fan, hongjin] nanyang technol univ, div phys, sch phys & math sci, singapore 637371, singapore. [liu, xiaoyang] jilin univ, coll chem, state key lab inorgan synth & preparat chem, changchun 130012, peoples r china.;sui, y (reprint author), harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china;suiyu@hit.edu.cn
关键词	Transport-properties Infinite Dimensions Recent Progress Thin-films Oxide Transition Ca3co4o9 Systems Magnetoresistance Fabrication
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32396
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Wang,Y. Sui,H. J. Fan,et al. High Temperature Thermoelectric Response of Electron-Doped CaMnO(3)[J]. Chemistry of Materials,2009,21(19):4653-4660.
APA	Y. Wang.,Y. Sui.,H. J. Fan.,X. J. Wang.,Y. T. Su.,...&X. Y. Liu.(2009).High Temperature Thermoelectric Response of Electron-Doped CaMnO(3).Chemistry of Materials,21(19),4653-4660.
MLA	Y. Wang,et al."High Temperature Thermoelectric Response of Electron-Doped CaMnO(3)".Chemistry of Materials 21.19(2009):4653-4660.