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나노 구조 물리 연구단
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Direct Observation of Inherent Atomic-Scale Defect Disorders responsible for High-Performance Ti1-xHfxNiSn1-ySby Half-Heusler Thermoelectric Alloys

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Title
Direct Observation of Inherent Atomic-Scale Defect Disorders responsible for High-Performance Ti1-xHfxNiSn1-ySby Half-Heusler Thermoelectric Alloys
Author(s)
Ki Sung Kim; Young-Min Kim; Hyeona Mun; Jisoo Kim; Jucheol Park; Albina Y. Borisevich; Kyu Hyoung Lee; Sung Wng Kim
Publication Date
2017-09
Journal
ADVANCED MATERIALS, v.29, no.36, pp.1702091 -
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Structural defects often dominate the electronic- and thermal-transport properties of thermoelectric (TE) materials and are thus a central ingredient for improving their performance. However, understanding the relationship between TE performance and the disordered atomic defects that are generally inherent in nanostructured alloys remains a challenge. Herein, the use of scanning transmission electron microscopy to visualize atomic defects directly is described and disordered atomic-scale defects are demonstrated to be responsible for the enhancement of TE performance in nanostructured Ti1-xHfxNiSn1-ySby half-Heusler alloys. The disordered defects at all atomic sites induce a local composition fluctuation, effectively scattering phonons and improving the power factor. It is observed that the Ni interstitial and Ti,Hf/Sn antisite defects are collectively formed, leading to significant atomic disorder that causes the additional reduction of lattice thermal conductivity. The Ti1-xHfxNiSn1-ySby alloys containing inherent atomic-scale defect disorders are produced in one hour by a newly developed process of temperature-regulated rapid solidification followed by sintering. The collective atomic-scale defect disorder improves the zT to 1.09 +/- 0.12 at 800 K for the Ti0.5Hf0.5NiSn0.98Sb0.02 alloy. These results provide a promising avenue for improving the TE performance of state-of-the-art materials. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/5517
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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