Influence of Y(3+) doping on the high-temperature transport mechanism and thermoelectric response of misfit-layered Ca(3)Co(4)O(9)

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	Influence of Y(3+) doping on the high-temperature transport mechanism and thermoelectric response of misfit-layered Ca(3)Co(4)O(9)
	Y. Wang; Y. Sui; J. G. Cheng; X. J. Wang; W. H. Su; H. J. Fan
	2010
发表期刊	Applied Physics a-Materials Science & Processing
ISSN	0947-8396
卷号	99 期号:2 页码:451-458
摘要	The high-temperature transport and thermoelectric characteristics of Ca(3-x) Y (x) Co(4)O(9) (x=0-0.75) series were studied up to 1000 K. The results reveal that the substitution of Y(3+) for Ca(2+) not only increases resistivity but also gradually alters the transport mechanism. The localization of carriers narrows bandwidth, which induces the evolution of the system from metal to variable-range hopping semiconductor and then to thermally activated semiconductor. The increasing thermopower with doping originates from the reduction of carrier concentration along with enhanced electronic correlations. Thermoelectric figure of merit ZT of Ca(3)Co(4)O(9) system is improved by Y doping. However, the optimal thermoelectric performance is found to only exist at the critical doping level where doping-induced metal-semiconductor transition occurs. This result suggests an intrinsic correlation between transport mechanism and thermoelectric response in this system.
部门归属	[wang, yang; sui, yu; cheng, jinguang; wang, xianjie; su, wenhui] harbin inst technol, dept phys, ctr condensed matter sci & technol, harbin 150001, peoples r china. [sui, yu; su, wenhui] acad sinica, int ctr mat phys, shenyang 110015, peoples r china. [wang, yang; fan, hongjin] nanyang technol univ, sch phys & math sci, div phys & appl phys, singapore 637371, singapore.;sui, y (reprint author), harbin inst technol, dept phys, ctr condensed matter sci & technol, harbin 150001, peoples r china;suiyu@hit.edu.cn
关键词	System Thermopower Performance Transition Electron Oxide Magnetoresistance Cobaltite Crystals Behavior
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31535
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,J. G. Cheng,et al. Influence of Y(3+) doping on the high-temperature transport mechanism and thermoelectric response of misfit-layered Ca(3)Co(4)O(9)[J]. Applied Physics a-Materials Science & Processing,2010,99(2):451-458.
APA	Y. Wang,Y. Sui,J. G. Cheng,X. J. Wang,W. H. Su,&H. J. Fan.(2010).Influence of Y(3+) doping on the high-temperature transport mechanism and thermoelectric response of misfit-layered Ca(3)Co(4)O(9).Applied Physics a-Materials Science & Processing,99(2),451-458.
MLA	Y. Wang,et al."Influence of Y(3+) doping on the high-temperature transport mechanism and thermoelectric response of misfit-layered Ca(3)Co(4)O(9)".Applied Physics a-Materials Science & Processing 99.2(2010):451-458.