Next Article in Journal
Switchable Two-Dimensional Liquid Crystal Grating in Blue Phase
Next Article in Special Issue
High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites
Previous Article in Journal
Heteroepitaxy, an Amazing Contribution of Crystal Growth to the World of Optics and Electronics
Previous Article in Special Issue
Structural and Electrical Properties Characterization of Sb1.52Bi0.48Te3.0 Melt-Spun Ribbons
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Crystals 2017, 7(6), 180; doi:10.3390/cryst7060180

Microstructure Analysis and Thermoelectric Properties of Melt-Spun Bi-Sb-Te Compounds

1
Energy Materials Center, Energy & Environment Division, Korea Institute of Ceramic Engineering & Technology, Jinju 52851, Korea
2
Materials R & D Center, Samsung Advanced Institute of Technology, Samsung Electronics, Suwon 16419, Korea
3
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
4
Department of Nano Applied Engineering, Kangwon National University, Chuncheon 24341, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: George S. Nolas
Received: 25 May 2017 / Revised: 19 June 2017 / Accepted: 19 June 2017 / Published: 20 June 2017
(This article belongs to the Special Issue Materials Processing and Crystal Growth for Thermoelectrics)
View Full-Text   |   Download PDF [5711 KB, uploaded 20 June 2017]   |  

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. View Full-Text
Keywords: thermoelectric; phonon scattering; melt spinning; Bi0.36Sb1.64Te3; nanostructure thermoelectric; phonon scattering; melt spinning; Bi0.36Sb1.64Te3; nanostructure
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Shin, W.H.; Yoon, J.S.; Jeong, M.; Song, J.M.; Kim, S.; Roh, J.W.; Lee, S.; Seo, W.S.; Kim, S.W.; Lee, K.H. Microstructure Analysis and Thermoelectric Properties of Melt-Spun Bi-Sb-Te Compounds. Crystals 2017, 7, 180.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Crystals EISSN 2073-4352 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top