Formation of highly oriented large nanoscale In 2Te 3 precipitates in bulk Bi 2Te 3

Nicholas A. Heinz, Teruyuki Ikeda, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Nucleation and growth precipitation experiments were conducted on samples of In-alloyed Bi 2Te 3 with a starting composition of Bi 1.65In 0.35Te 3 (7 at.% In) to investigate the phase diagram of the Bi 2Te 3-In 2Te 3 system. Temperature-dependent equilibrium solubilities were determined at 500 and 450 °C and also the maximum solubility of In in Bi 2Te 3 was verified by unidirectional solidification using the Bridgman method. The In 2Te 3 structures formed during precipitation are either plates or elongated ribbons with thicknesses of the order of hundreds of nanometers with a heavily temperature-dependent spacing distribution. All in-grain precipitation occurs along the {0 0 0 1} family of planes in Bi 2Te 3. The orientation relationship between Bi 2Te 3-In 2Te 3 was found to be {0 0 0 1}Bi 2Te 3 ∥ {1 1 1}In 2Te 3 and consequently 〈112̄0〉 Bi 2Te 3 ∥ 〈1 1 0〉 In 2Te 3, which aligns the close-packed planes and directions. The resulting matrix is expected to be lightly doped and may be suitable for microstructure engineering for near room temperature thermoelectric applications.

Original languageEnglish (US)
Pages (from-to)4461-4467
Number of pages7
JournalActa Materialia
Volume60
Issue number11
DOIs
StatePublished - Jun 1 2012

Keywords

  • Bulk thermoelectric Bi Te
  • Heterogeneous nucleation of phase transformations
  • Microstructure
  • Nanocomposite
  • Precipitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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