Formation of ordered nano-wire microstructures in thermoelectric Pb-Ag-Sb-Te

Hsin-Jay Wu, S. W. Chen*, T. Ikeda, G. J. Snyder

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Regular arrays of nano-wire microstructures containing Ag 2Te rods with diameter <400 nm and inter-rod distance <1 μm are formed in a matrix of AgSbTe 2 + δ-Sb 2Te, which makes an ordered nano-wire composite thermoelectric material. This microstructure is formed during eutectic solidification processing. To understand and guide production of uniform bulk samples of this composite, the liquidus projection of quaternary Pb-Ag-Sb-Te system at 36.0 at.% Te isoplethal section is constructed experimentally, using quenched samples. A three-phase univariant reaction of the quaternary Pb-Ag-Sb-Te system, L → AgSbTe 2 + Ag 2Te + δ-Sb 2Te, is investigated, between a ternary-eutectic melt (Ag-40.0 at.% Sb-36.0 at.% Te) and a quaternary melt (Pb-22.0 at.% Ag-40.0 at.% Sb-36.0 at.% Te), at 496.1 °C and 503.9 °C, respectively. High-resolution transmission electron microscopy confirms that these three phases are simultaneously present at the nanometer scale. Furthermore, unidirectional solidification experiments of the ternary eutectic alloy using the Bridgman method are carried out to examine the alloy's solidification behavior.

Original languageEnglish
Pages (from-to)1129-1138
Number of pages10
JournalActa Materialia
Volume60
Issue number3
DOIs
StatePublished - 1 Feb 2012

Keywords

  • Bridgman technique
  • Eutectic solidification
  • Nanostructure
  • Solidification microstructure
  • Thermodynamics

Fingerprint Dive into the research topics of 'Formation of ordered nano-wire microstructures in thermoelectric Pb-Ag-Sb-Te'. Together they form a unique fingerprint.

  • Cite this