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The phase equilibria in the Bi–S–I ternary system and thermodynamic properties of the BiSI and Bi19S27I3ternary compounds

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Volume
610
Identifiers
DOI: 10.1016/j.jallcom.2014.05.015
Keywords
  • Phase Diagram
  • Bismuth Sulfide Halides
  • Bismuth Triiodide
  • Bismuth Sulfide
  • Electromotive Forces
  • Thermodynamic Functions
Disciplines
  • Physics

Abstract

Abstract Phase equilibria in the entire Bi–S–I ternary system were determined experimentally by means of differential thermal analysis (DTA), X-ray diffraction (XRD) techniques and EMF measurements. Several vertical sections, an isothermal section at 300K, and a liquidus surface projection of the system were constructed and two ternary compounds BiSI and Bi19S27I3 reported earlier were confirmed. The primary crystallization fields of all phases, the types and coordinates of invariant and monovariant equilibria were determined. Thermodynamic properties of the both BiSI and Bi19S27I3 ternary compounds were studied by electromotive force measurements (EMF) with the bismuth electrode. From the EMF measurements, the partial molar functions of bismuth in alloys and the standard integral thermodynamic functions of BiSI and Bi19S27I3 were calculated.

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