| Vibrational hierarchy leads to dual-phonon transport in low thermal conductivity crystals | |
| Luo, Yixiu1,2,3; Yang, Xiaolong1,2,4; Feng, Tianli5; Wang, Jingyang3; Ruan, Xiulin1,2 | |
| Corresponding Author | Ruan, Xiulin(ruan@purdue.edu) |
| 2020-05-22 | |
| Source Publication | NATURE COMMUNICATIONS
 |
| ISSN | 2041-1723 |
| Volume | 11Issue:1Pages:10 |
| Abstract | Many low-thermal-conductivity (kappa (L)) crystals show intriguing temperature (T) dependence of kappa (L): kappa T-L(-1) (crystal-like) at intermediate temperatures whereas weak T-dependence (glass-like) at high temperatures. It has been in debate whether thermal transport can still be described by phonons at the Ioffe-Regel limit. In this work, we propose that most phonons are still well defined for thermal transport, whereas they carry heat via dual channels: normal phonons described by the Boltzmann transport equation theory, and diffuson-like phonons described by the diffusion theory. Three physics-based criteria are incorporated into first-principles calculations to judge mode-by-mode between the two phonon channels. Case studies on La2Zr2O7 and Tl3VSe4 show that normal phonons dominate low temperatures while diffuson-like phonons dominate high temperatures. Our present dual-phonon theory enlightens the physics of hierarchical phonon transport as approaching the Ioffe-Regel limit and provides a numerical method that should be practically applicable to many materials with vibrational hierarchy. p id=Par Predicting thermal transport in low-thermal-conductivity (kappa (L)) materials is challenging. Here, the authors propose a dual-phonon theory, where normal phonons are treated using the Boltzmann thermal equation and diffuson-like phonons are treated within diffusion theory, yielding robust predictions of kappa (L). |
| Funding Organization | China Scholarship Council ; Shenyang National Laboratory for Materials Science ; project entitled Models to Evaluate and Guide the Development of Low Thermal Conductivity Materials for Building Envelopes - Building Technologies Office (BTO), Office of Energy Efficiency & Renewable Energy (EERE) at the Department of Energy (DOE) ; Defense Advanced Research Projects Agency |
| DOI | 10.1038/s41467-020-16371-w |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | China Scholarship Council ; Shenyang National Laboratory for Materials Science ; project entitled Models to Evaluate and Guide the Development of Low Thermal Conductivity Materials for Building Envelopes - Building Technologies Office (BTO), Office of Energy Efficiency & Renewable Energy (EERE) at the Department of Energy (DOE) ; Defense Advanced Research Projects Agency[HR0011-15-2-0037] |
| WOS Research Area | Science & Technology - Other Topics |
| WOS Subject | Multidisciplinary Sciences |
| WOS ID | WOS:000537134500001 |
| Publisher | NATURE PUBLISHING GROUP |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/139061 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Ruan, Xiulin |
| Affiliation | 1.Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA 2.Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 4.Shenzhen Univ, Inst Adv Study, Shenzhen 518060, Peoples R China 5.Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA |
| Recommended Citation GB/T 7714 | Luo, Yixiu,Yang, Xiaolong,Feng, Tianli,et al. Vibrational hierarchy leads to dual-phonon transport in low thermal conductivity crystals[J]. NATURE COMMUNICATIONS,2020,11(1):10. |
| APA | Luo, Yixiu,Yang, Xiaolong,Feng, Tianli,Wang, Jingyang,&Ruan, Xiulin.(2020).Vibrational hierarchy leads to dual-phonon transport in low thermal conductivity crystals.NATURE COMMUNICATIONS,11(1),10. |
| MLA | Luo, Yixiu,et al."Vibrational hierarchy leads to dual-phonon transport in low thermal conductivity crystals".NATURE COMMUNICATIONS 11.1(2020):10. |
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