Bi2Te3 filaments via extrusion and pressureless sintering of Bi2Te3-based inks

Christoph Kenel, Nicholas R. Geisendorfer, Jun Peng, Matthew A. Grayson, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract

Abstract: Inks containing sub-20 µm particles of doped bismuth telluride (n-type Bi2Te2.73Se0.3 or p-type (Bi0.5Sb1.5)Te3) are extruded into 330 µm diameter filaments. When solid-state sintered up to 857 K under no pressure, the filaments only partially densify, with over 20% porosity remaining. Coating the filament with TeO2 powder, followed by hydrogen reduction to liquid Te, enables liquid phase sintering at 710 K, with rapid densification to less than 5% porosity within 1 h. Coating with a stoichiometric blend of Bi2O3 + 3TeO2 powders, followed by hydrogen reduction to liquid Bi and Te, provides transient liquid phase sintering at 808 K and subsequent reaction to Bi2Te3, resulting in fast filament densification, to less than 5% porosity within 10 min without residual Te. Graphic abstract: [Figure not available: see fulltext.].

Original languageEnglish (US)
Pages (from-to)818-824
Number of pages7
JournalMRS Communications
Volume11
Issue number6
DOIs
StatePublished - Dec 2021

Keywords

  • Coating
  • Extrusion
  • Oxide
  • Sintering
  • Thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Bi2Te3 filaments via extrusion and pressureless sintering of Bi2Te3-based inks'. Together they form a unique fingerprint.

Cite this