Liquidus projection and isothermal section at 650 °c of ternary Co-Sb-Ga system

Sinn Wen Chen*, Yuan Chun Chien, Wei An Chen, Jui Shen Chang, Ssu Ming Tseng, G. Jeffrey Snyder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Co-Sb-Ga ternary system is of interests for thermoelectric applications. Alloys quenched from completely molten state with compositions of the entire Co-Sb-Ga regime and alloys equilibrated at 650 °C with compositions in the CoSb3-CoGa-Ga-Sb regime were prepared and analyzed. The liquidus projection and isothermal section at 650 °C of ternary Co-Sb-Ga system were determined based on these experimental results and the phase diagrams of its three constituent binary systems. The liquidus projection has 10 primary solidification phase regions. They are Co, CoSb, CoSb2, CoSb3, Sb, GaSb, Ga, CoGa3, CoGa and a ternary compound, Co3Sb2Ga4, which is newly found. There are three class I and six class II invariant reactions involving with liquid phase. Except for the L ← Co + CoSb + CoGa, L + CoGa ← Co3Sb2Ga4 + GaSb reaction, the reaction temperatures are determined using DTA. In the CoSb3-CoGa-Ga-Sb region, there are 5 tie-triangles, which are CoSb3 + Liquid + GaSb, Co3Sb2Ga4 + CoSb3 + GaSb, CoGa + Co3Sb2Ga4 + GaSb, CoGa + GaSb + CoGa3, and CoGa3 + GaSb + Liquid. The ternary solubilities in most of the binary compounds are not significant, and the highest is 3.5 at.% Sb in the CoGa.

Original languageEnglish (US)
Pages (from-to)98-105
Number of pages8
JournalJournal of Alloys and Compounds
Volume637
DOIs
StatePublished - Jul 15 2015

Keywords

  • Isothermal section
  • Liquidus projection
  • Thermoelectric material

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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