| First-order phase transition characteristic of the high temperature metal-semiconductor transition in [Ca2CoO3](0.62)[CoO2] | |
| Cheng, Jinguang1; Sui, Yu1,2; Wang, Yang1; Wang, Xianjie1; Su, Wenhui1,2 | |
| Corresponding Author | Sui, Yu(suiyu@hit.edu.cn) |
| 2009-03-01 | |
| Source Publication | APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
 |
| ISSN | 0947-8396 |
| Volume | 94Issue:4Pages:911-916 |
| Abstract | 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. |
| Funding Organization | National Natural Science Foundation of China |
| DOI | 10.1007/s00339-008-4849-8 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[50672019] |
| WOS Research Area | Materials Science ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Physics, Applied |
| WOS ID | WOS:000263069700028 |
| Publisher | SPRINGER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/99520 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Sui, Yu |
| Affiliation | 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 |
| Recommended Citation 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. |
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