Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Enhancement of Thermoelectric Performance in Spark Plasma Sintered p-Type Bi0.5Sb1.5Te3.0 Compound via Hot Isostatic Pressing (HIP) Induced Reduction of Lattice Thermal Conductivity

열간등방가압 공정을 통한 P형 Bi0.5Sb1.5Te3.0 소결체의 격자 열전도도 감소 및 열전 특성 향상

  • Soo-Ho Jung (Department of 3D Printing Materials, Powder Materials Division, Korea Institute of Materials Science (KIMS)) ;
  • Ye Jin Woo (Department of 3D Printing Materials, Powder Materials Division, Korea Institute of Materials Science (KIMS)) ;
  • Kyung Tae Kim (Department of 3D Printing Materials, Powder Materials Division, Korea Institute of Materials Science (KIMS)) ;
  • Seungki Jo (Department of 3D Printing Materials, Powder Materials Division, Korea Institute of Materials Science (KIMS))
  • 정수호 (한국재료연구원 분말재료연구본부 3D프린팅재료연구실) ;
  • 우예진 (한국재료연구원 분말재료연구본부 3D프린팅재료연구실) ;
  • 김경태 (한국재료연구원 분말재료연구본부 3D프린팅재료연구실) ;
  • 조승기 (한국재료연구원 분말재료연구본부 3D프린팅재료연구실)
  • Received : 2023.04.04
  • Accepted : 2023.04.21
  • Published : 2023.04.28
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Abstract

High-temperature and high-pressure post-processing applied to sintered thermoelectric materials can create nanoscale defects, thereby enhancing their thermoelectric performance. Here, we investigate the effect of hot isostatic pressing (HIP) as a post-processing treatment on the thermoelectric properties of p-type Bi0.5Sb1.5Te3.0 compounds sintered via spark plasma sintering. The sample post-processed via HIP maintains its electronic transport properties despite the reduced microstructural texturing. Moreover, lattice thermal conductivity is significantly reduced owing to activated phonon scattering, which can be attributed to the nanoscale defects created during HIP, resulting in an ~18% increase in peak zT value, which reaches ~1.43 at 100℃. This study validates that HIP enhances the thermoelectric performance by controlling the thermal transport without having any detrimental effects on the electronic transport properties of thermoelectric materials.

Keywords

Acknowledgement

본 연구는 한국재료연구원 주요사업(과제번호: PNK8960)의 지원을 받아 수행되었으며 이에 감사드립니다.

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