DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Choi, Pyuck-Pa | - |
dc.contributor.advisor | 최벽파 | - |
dc.contributor.author | Park, Hail | - |
dc.date.accessioned | 2022-04-21T19:32:14Z | - |
dc.date.available | 2022-04-21T19:32:14Z | - |
dc.date.issued | 2021 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=963536&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/295472 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2021.8,[iii, 25 p. :] | - |
dc.description.abstract | NbCoSn-based half-heusler thermoelectric materials are promising materials for next-generation eco-friendly energy that not only have excellent mechanical properties and thermal stability but also consist of low-cost elements compared to other thermoelectric materials, showing advantages. However, the high thermal conductivity of the material contributes to the low value of the Figure of merit, ZT, which represents the thermoelectric performance, and is limited in its practical use. We performed a study to reduce thermal conductivity by forming ultra-fine grain size of NbCo$_{1.1}$SnSb$_{0.1}$ Heusler thermoelectric materials. Ball milling of the amorphous NbCo$_{1.1}$Sn ribbon formed NbCo$_2$Sn full Heusler nanocrystals for the formation of heterogeneous nucleation sites, which were confirmed by the Atom probe tomography, STEM, and correlative research. In addition, Sb doping increased the electrical conductivity to obtain a ZT value of 0.57. We expect this study of grain size refinement via ball milling of amorphous alloys can be applied to other thermoelectric materials for improving ZT. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Heulser alloy▼aThermoelectric material▼aGrain refinement▼aBall milling▼aCrystallization | - |
dc.subject | 호이즐러합금▼a열전재료▼a결정립미세화▼a볼밀링▼a결정화 | - |
dc.title | Improving thermoelectric performance of NbCo1.1SnSb0.1 with grain size refinement via ball milling induced crystallization | - |
dc.title.alternative | 볼 밀링에 의해 유도된 결정화를 통한 그레인 사이즈 감소와 NbCo1.1SnSb0.1 열전 재료 성능 향상에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 박하일 | - |
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