First-order phase transition characteristic of the high temperature metal-semiconductor transition in Ca(2)CoO(3) (0.62) CoO(2)

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	First-order phase transition characteristic of the high temperature metal-semiconductor transition in Ca(2)CoO(3) (0.62) CoO(2)
	J. G. Cheng ; Y. Sui ; Y. Wang ; X. J. Wang ; W. H. Su
刊名	Applied Physics a-Materials Science & Processing
	2009
卷号	94 期号:4 页码:911-916
关键词	thermoelectric properties ca3co4o9 ceramics system
ISSN号	0947-8396
中文摘要	Transportation and thermodynamic properties of misfit-layered polycrystalline [Ca(2)CoO(3)](0.62)[CoO(2)] 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 [CoO(2)] 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.
原文出处	://WOS:000263069700028
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/31848]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	J. G. Cheng,Y. Sui,Y. Wang,et al. First-order phase transition characteristic of the high temperature metal-semiconductor transition in Ca(2)CoO(3) (0.62) CoO(2)[J]. Applied Physics a-Materials Science & Processing,2009,94(4):911-916.
APA	J. G. Cheng,Y. Sui,Y. Wang,X. J. Wang,&W. H. Su.(2009).First-order phase transition characteristic of the high temperature metal-semiconductor transition in Ca(2)CoO(3) (0.62) CoO(2).Applied Physics a-Materials Science & Processing,94(4),911-916.
MLA	J. G. Cheng,et al."First-order phase transition characteristic of the high temperature metal-semiconductor transition in Ca(2)CoO(3) (0.62) CoO(2)".Applied Physics a-Materials Science & Processing 94.4(2009):911-916.