First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2]

doi:10.1007/s00339-008-4849-8

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	First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2]
	Cheng, Jinguang 1; Sui, Yu 1,2; Wang, Yang 1; Wang, Xianjie 1; Su, Wenhui 1,2
通讯作者	Sui, Yu(suiyu@hit.edu.cn)
	2009-03-01
发表期刊	APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
ISSN	0947-8396
卷号	94 期号:4 页码:911-916
摘要	Transportation and thermodynamic properties of misfit-layered polycrystalline [Ca2CoO3](0.62)[CoO2] were measured in order to clarify the nature of metal- semiconductor transition (MST) at T (MS)a parts per thousand 400 K, above which the simultaneous decrease of resistivity and increase of thermopower with temperature give rise to a great enhancement of thermoelectric power factor up to 1000 K. A first-order phase transition characteristic around T (MS) was revealed by anomalies of resistivity, differential scanning calorimetry, and thermal expansion. The first-order characteristic of the MST can be rationalized from the Virial theorem at an itinerant to localized electron transition in the narrow e (T) band within the [CoO2] plane. Above T (MS), the reduction of the retained delocalized states within the matrix of localized states and the enhancement of charge carrier effective mass with increasing temperature might account for the considerable enhancement of the thermopower.
资助者	National Natural Science Foundation of China
DOI	10.1007/s00339-008-4849-8
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[50672019]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号	WOS:000263069700028
出版者	SPRINGER
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/99520
专题	中国科学院金属研究所
通讯作者	Sui, Yu
作者单位	1.Harbin Inst Technol, Ctr Condensed Matter Sci & Technol, Dept Phys, Harbin 150001, Peoples R China 2.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Jinguang,Sui, Yu,Wang, Yang,et al. First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2][J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2009,94(4):911-916.
APA	Cheng, Jinguang,Sui, Yu,Wang, Yang,Wang, Xianjie,&Su, Wenhui.(2009).First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2].APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,94(4),911-916.
MLA	Cheng, Jinguang,et al."First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2]".APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 94.4(2009):911-916.