Structurally nanocrystalline electrically monocrystalline Sb 2 Te 3 with high thermoelectric performance

Xiaofang Lu, Ping Lu, Yuchi Fan, Weiwei Zhou, Shijia Gu, Zhenxing Zhou, Jie Zhang, Li Su, Lianjun Wang, Wan Jiang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A highly textured pure Sb 2 Te 3 is fabricated via a hydrothermal method combined with high-pressure spark plasma sintering. The nanoscale texture gives rise to an extremely low thermal conductivity in the out-of-plane direction, while shows weak influence on the carrier mobility which reaches the level of single crystal. Microstructure analysis reveals large amount of low-angle boundaries, whose discriminated effect on scattering phonons and carriers should account for the observed phenomenon. Consequently, the structurally nanocrystalline electrical monocrystalline behavior leads to a high average ZT with peak value above 1 at 525 K, which is the best TE performance for undoped Sb 2 Te 3 .

Original languageEnglish
Pages (from-to)81-86
Number of pages6
JournalScripta Materialia
Volume166
DOIs
Publication statusPublished - 2019 Jun

Keywords

  • Low-angle boundary
  • Sb Te
  • Texture
  • Thermoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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