Structural phase transitions and sodium ordering in Na0.5CoO2: a combined electron diffraction and Raman spectroscopy study
文献类型：期刊论文
| 作者 | Yang, HX ; Nie, CJ ; Shi, YG ; Yu, HC ; Ding, S ; Liu, YL ; Wu, D ; Wang, NL ; Li, JQ |
| 刊名 | SOLID STATE COMMUNICATIONS
 |
| 出版日期 | 2005 |
| 卷号 | 134期号:6页码:403 |
| 关键词 | LIXCOO2 LITHIUM DENSITY NACO2O4 |
| ISSN号 | 0038-1098 |
| 通讯作者 | Yang, HX (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China. |
| 中文摘要 | The nonstoichiometric NaxCoO2 system exhibits extraordinary physical properties that correlate with temperature and Na concentration in its layered lattice without evident long-range structure modification when conventional crystallographic techniques are applied. For instance, Na0.7CoO2, a thermodynamically stable phase, shows large thermoelectric power; water-intercalated Na(0.33)CoO(2)(.)1.3H(2)O is a newly discovered superconductor with T(c)similar to 4 K, and Na0.5CoO2 exhibits an unexpected charge ordering transition at around T(infinity)similar to 55 K. Recent studies suggest that the transport and magnetic properties in the NaxCoO2 system strongly depend on the charge carrier density and local structural properties. Here we report a combined variable temperature transmission electron microscopy and Raman scattering investigation on structural transformations in Na0.5CoO2 single crystals. A series of structural phase transitions in the temperature range from 80 to 1000 K are directly identified and the observed superstructures and modulated phases can be interpreted by Na-ordering. The Raman scattering measurements reveal phase separation and a systematic evolution of active modes along with phase transitions. Our work demonstrates that the high mobility and ordering of sodium cations among the CoO2 layers are a key factor for the presence of complex structural properties in NaxCoO2 materials, and also demonstrate that the combination of electron diffraction and Raman spectroscopy measurements is an efficient way for studying the cation ordering and phase transitions in related systems. (c) 2005 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/53328]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Yang, HX,Nie, CJ,Shi, YG,et al. Structural phase transitions and sodium ordering in Na0.5CoO2: a combined electron diffraction and Raman spectroscopy study[J]. SOLID STATE COMMUNICATIONS,2005,134(6):403. |
| APA | Yang, HX.,Nie, CJ.,Shi, YG.,Yu, HC.,Ding, S.,...&Li, JQ.(2005).Structural phase transitions and sodium ordering in Na0.5CoO2: a combined electron diffraction and Raman spectroscopy study.SOLID STATE COMMUNICATIONS,134(6),403. |
| MLA | Yang, HX,et al."Structural phase transitions and sodium ordering in Na0.5CoO2: a combined electron diffraction and Raman spectroscopy study".SOLID STATE COMMUNICATIONS 134.6(2005):403. |
入库方式： OAI收割
来源：物理研究所
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