Microstructure analysis and thermoelectric properties of melt-spun Bi-Sb-Te compounds

Weon Ho Shin, Jeong Seop Yoon, Mahn Jeong, Jae Min Song, Seyun Kim, Jong Wook Roh, Soonil Lee, Won Seon Seo, Sung Wng Kim, Kyu Hyoung Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In order to realize high-performance thermoelectric materials, a way to obtain small grain size is necessary for intensification of the phonon scattering. Here, we use a melt-spinning-spark plasma sintering process for making p-type Bi0.36Sb1.64Te3 thermoelectric materials and evaluate the relation between the process conditions and thermoelectric performance. We vary the Cu wheel rotation speed from 1000 rpm (~13 ms-1) to 4000 rpm (~52 ms-1) during the melt spinning process to change the cooling rate, allowing us to control the characteristic size of nanostructure in melt-spun Bi0.36Sb1.64Te3 ribbons. The higher wheel rotation speed decreases the size of nanostructure, but the grain sizes of sintered pellets are inversely proportional to the nanostructure size after the same sintering condition. As a result, the ZT values of the bulks fabricated from 1000–3000 rpm melt-spun ribbons are comparable each other, while the ZT value of the bulk from the 4000 rpm melt-spun ribbons is rather lower due to reduction of grain boundary phonon scattering. In this work, we can conclude that the smaller nanostructure in the melt spinning process does not always guarantee high-performance thermoelectric bulks, and an adequate following sintering process must be included.

Original languageEnglish
Article number180
JournalCrystals
Volume7
Issue number6
DOIs
Publication statusPublished - 2017 Jun 20

Fingerprint

melt spinning
ribbons
Melt spinning
Nanostructures
sintering
thermoelectric materials
wheels
microstructure
Microstructure
Phonon scattering
grain size
Wheels
Sintering
sparks
scattering
pellets
Spark plasma sintering
grain boundaries
cooling
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

Cite this

Shin, Weon Ho ; Yoon, Jeong Seop ; Jeong, Mahn ; Song, Jae Min ; Kim, Seyun ; Roh, Jong Wook ; Lee, Soonil ; Seo, Won Seon ; Kim, Sung Wng ; Lee, Kyu Hyoung. / Microstructure analysis and thermoelectric properties of melt-spun Bi-Sb-Te compounds. In: Crystals. 2017 ; Vol. 7, No. 6.
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Shin, WH, Yoon, JS, Jeong, M, Song, JM, Kim, S, Roh, JW, Lee, S, Seo, WS, Kim, SW & Lee, KH 2017, 'Microstructure analysis and thermoelectric properties of melt-spun Bi-Sb-Te compounds', Crystals, vol. 7, no. 6, 180. https://doi.org/10.3390/cryst7060180

Microstructure analysis and thermoelectric properties of melt-spun Bi-Sb-Te compounds. / Shin, Weon Ho; Yoon, Jeong Seop; Jeong, Mahn; Song, Jae Min; Kim, Seyun; Roh, Jong Wook; Lee, Soonil; Seo, Won Seon; Kim, Sung Wng; Lee, Kyu Hyoung.

In: Crystals, Vol. 7, No. 6, 180, 20.06.2017.

Research output: Contribution to journalArticle

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AU - Yoon, Jeong Seop

AU - Jeong, Mahn

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AU - Kim, Seyun

AU - Roh, Jong Wook

AU - Lee, Soonil

AU - Seo, Won Seon

AU - Kim, Sung Wng

AU - Lee, Kyu Hyoung

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Y1 - 2017/6/20

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