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DOI | 10.1038/ncomms14952 |
Unraveling the dislocation core structure at a van der Waals gap in bismuth telluride | |
Medlin, D. L.1; Yang, N.1; Spataru, C. D.1; Hale, L. M.2; Mishin, Y.3 | |
2019-04-23 | |
发表期刊 | NATURE COMMUNICATIONS
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ISSN | 2041-1723 |
出版年 | 2019 |
卷号 | 10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Tetradymite-structured chalcogenides such as bismuth telluride (Bi2Te3) are of significant interest for thermoelectric energy conversion and as topological insulators. Dislocations play a critical role during synthesis and processing of such materials and can strongly affect their functional properties. The dislocations between quintuple layers present special interest since their core structure is controlled by the van der Waals interactions between the layers. In this work, using atomic-resolution electron microscopy, we resolve the basal dislocation core structure in Bi2Te3, quantifying the disregistry of the atomic planes across the core. We show that, despite the existence of a stable stacking fault in the basal plane gamma surface, the dislocation core spreading is mainly due to the weak bonding between the layers, which leads to a small energy penalty for layer sliding parallel to the van der Waals gap. Calculations within a semidiscrete variational Peierls-Nabarro model informed by first-principles calculations support our experimental findings. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465200000001 |
WOS关键词 | TOPOLOGICAL-INSULATOR ; THERMOELECTRIC PROPERTIES ; STACKING-FAULTS ; DIRAC STATES ; BI2TE3 ; DEFORMATION ; PERFORMANCE ; SURFACE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/203281 |
专题 | 资源环境科学 |
作者单位 | 1.Sandia Natl Labs, Livermore, CA 94551 USA; 2.NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA; 3.George Mason Univ, Dept Phys & Astron, MSN 3F3, Fairfax, VA 22030 USA |
推荐引用方式 GB/T 7714 | Medlin, D. L.,Yang, N.,Spataru, C. D.,et al. Unraveling the dislocation core structure at a van der Waals gap in bismuth telluride[J]. NATURE COMMUNICATIONS,2019,10. |
APA | Medlin, D. L.,Yang, N.,Spataru, C. D.,Hale, L. M.,&Mishin, Y..(2019).Unraveling the dislocation core structure at a van der Waals gap in bismuth telluride.NATURE COMMUNICATIONS,10. |
MLA | Medlin, D. L.,et al."Unraveling the dislocation core structure at a van der Waals gap in bismuth telluride".NATURE COMMUNICATIONS 10(2019). |
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