Highly fluidic liquid at homointerface generates grain-boundary dislocation arrays for high-performance bulk thermoelectrics
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 문현아 | - |
dc.contributor.author | 이규형 | - |
dc.contributor.author | 유승조 | - |
dc.contributor.author | 김현식 | - |
dc.contributor.author | 정지원 | - |
dc.contributor.author | 오상호 | - |
dc.contributor.author | G. J. Snyder | - |
dc.contributor.author | 김영희 | - |
dc.contributor.author | 김영민 | - |
dc.contributor.author | 김성웅 | - |
dc.date.available | 2020-07-10T04:18:44Z | - |
dc.date.created | 2020-07-08 | - |
dc.date.issued | 2018-10 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/3171 | - |
dc.description.abstract | Dislocation arrays embedded in low-angle grain-boundaries have emerged as an effective structural defect for a dramatic improvement of thermoelectric performance by reducing thermal conductivity [1] A transient liquid-flow assisted compacting process has been employed for p-type Bi0.5Sb1.5Te3 material to generate the dislocation arrays at grain-boundaries. The details of underlying formation mechanism are crucial for the feasibility of the process on other state-of-the-art thermoelectric materials but have not been well understood. Here, we report the direct observation of dislocation formation process at grain-boundaries of Sb2Te3 system as a proof-of-concept material. We found that the formation of homointerface between Te-terminated Sb2Te3 matrix phase and Te liquid atomic-layer of secondary phase is a prerequisite factor to achieve the low-energy liquid-solid homointerface at compacting elevated temperature. We further demonstrate from the successful observations of atomic structure in the intermediate state of the compacted pellet that the high self-diffusion rate of Te atoms at the liquid-solid homointerface facilitates an effective grain rearrangement, generating low-energy grain-boundaries embedded with dense dislocation arrays. These results pave the way to improve thermoelectric performance of various materials where dislocation arrays are generated by transient liquid-flow assisted compacting process using precursors with an interface constructed with the same types of atoms. (C) 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.language.iso | en | - |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | - |
dc.title | Highly fluidic liquid at homointerface generates grain-boundary dislocation arrays for high-performance bulk thermoelectrics | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | 김현식 | - |
dc.identifier.bibliographicCitation | ACTA MATERIALIA, v.159, no.-, pp.266 - 275 | - |
dc.relation.isPartOf | ACTA MATERIALIA | - |
dc.citation.title | ACTA MATERIALIA | - |
dc.citation.volume | 159 | - |
dc.citation.number | - | - |
dc.citation.startPage | 266 | - |
dc.citation.endPage | 275 | - |
dc.type.rims | ART | - |
dc.description.journalClass | 1 | - |
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