Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation
文献类型：期刊论文
| 作者 | Wang, Yang2,3; Sui, Yu2,4; Wang, Xianjie2; Su, Wenhui2; Liu, Xiaoyang1; Fan, Hong Jin3 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2010-11-01 |
| 卷号 | 58期号:19页码:6306-6316 |
| 关键词 | Manganite perovskite Thermal conductivity Spin-phonon scattering MnO6 distortion Optical phonon |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2010.07.052 |
| 通讯作者 | Sui, Yu(suiyu@hit.edu.cn) |
| 英文摘要 | The thermal transport properties of a series of electron-doped CaMnO3 perovskites have been investigated. Throughout the temperature range 5-300 K, phonon thermal conductivity is dominant, and both electron and spin wave contributions are negligible. The short phonon mean free paths in this system result in the relatively low thermal conductivities. The strong phonon scatterings stem from the A-site mismatch and bond-length fluctuations induced by local distortions of MnO6 octahedra. The thermal conductivity in the magnetically ordered state is enhanced as a result of the decrease in spin-phonon scattering. The results also indicate that above the magnetic ordering temperature, observable thermal excitation of optical phonons occurs. The contribution of optical phonons to thermal conductivity becomes non-negligible and is proposed to play an important role in the glass-like thermal transport behavior (i.e. positive temperature dependence of the thermal conductivity) in the paramagnetic state. These features can be understood in terms of an expression of thermal conductivity that includes both acoustic and optical phonon terms. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 资助项目 | Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry) ; Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT NSRIF)[2009056] ; National Natural Science Foundation of China[10804024] ; Nanyang Technological University |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000283807900010 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry) ; Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT NSRIF) ; National Natural Science Foundation of China ; Nanyang Technological University |
| 源URL | [http://ir.imr.ac.cn/handle/321006/101027]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Sui, Yu |
| 作者单位 | 1.Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China 2.Harbin Inst Technol, Dept Phys, CCMST, Harbin 150001, Peoples R China 3.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore 4.Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yang,Sui, Yu,Wang, Xianjie,et al. Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation[J]. ACTA MATERIALIA,2010,58(19):6306-6316. |
| APA | Wang, Yang,Sui, Yu,Wang, Xianjie,Su, Wenhui,Liu, Xiaoyang,&Fan, Hong Jin.(2010).Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation.ACTA MATERIALIA,58(19),6306-6316. |
| MLA | Wang, Yang,et al."Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation".ACTA MATERIALIA 58.19(2010):6306-6316. |
入库方式： OAI收割
来源：金属研究所
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