Preparation and thermoelectric properties of micro-nanostructured Yb0.3Co4Sb12

Xingguo Wu, Beiying Zhou, Zhenxing Zhou, Hongwei Shen, Lianjun Wang, Wan Jiang

Research output: Contribution to journalArticlepeer-review

Abstract

Yb-filled bulk CoSb3 skutterudites were prepared by melting method combining with Spark Plasma Sintering (SPS). Bulk Yb0.3Co4Sb12 compounds with superior thermoelectric properties (ZT=1.19, 800 K) were achieved at last. Then high-energy ball milling was employed to prepare nano-sized particles. After that, the nano-sized Yb0.3Co4Sb12 particles were sintered by SPS apparatus to get bulk sample. Particle morphology and microstructure observation were performed by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). The thermoelectric properties of bulk materials were measured by ZEM-3 and LFA427. There were no decomposition and crystal form transition appeared after milling 10 h according to XRD patterns. The particle size decreased greatly according to FESEM and TEM observation and after sintering the grain size was ~500 nm and partly was less than 100 nm. Compared with the bulk without milling, the Seebeck coefficient after milling increased a little and thermal conductivity decreased 1/3. However, at the same time, the electrical conductivity decreased about 10 times so that the ZT of milled bulk Yb0.3Co4Sb12 decreased.

Original languageEnglish
Pages (from-to)64-68
Number of pages5
JournalMaterials China
Volume35
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Bulk YbCoSb
  • High-energy ball milling
  • Nano-sized particles
  • Thermoelectric materials
  • Thermoelectric properties

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality

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