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The Excess Enthalpies of Liquid Ag-Sb-Te and Ag-Bi-Te Alloys

  • Frank Römermann and Roger Blachnik EMAIL logo
Published/Copyright: December 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 92 Issue 1

Abstract

The excess enthalpies of liquid alloys in the ternary systems Ag–Sb–Te and Ag–Bi–Te were determined in a heat flow calorimeter for five sections AgyBi1–yTe with y = 0.2, 0.4, 0.5, 0.6, and 0.8 at 1173 K, for the section Ag0.5Bi0.5–Te at 1073 K, and to complete recent measurements at 1073 and 1173 K for the section Ag0.5Sb0.5–Te. The thermodynamic functions of the systems Ag–Sb, Ag–Bi and Ag–Te were reoptimized with the Lukas programs using the association model. Ternary interactions were taken into account for the analytical description of the excess enthalpies of the liquid Ag–Sb–Te and Ag–Bi–Te alloys. The enthalpy surfaces of the systems are determined by valleys of exothermic minima between the congruently melting compounds in the binary tellurium systems. The values of exothermic enthalpies decrease with increasing temperature, due to the dissociation of the telluride associates in the binary systems.

Abstract

Die Exzeßenthalpien flüssiger Legierungen der ternären Systeme Ag–Sb–Te und Ag–Bi–Te wurden für fünf Schnitte AgyBi1–y–Te (y = 0.2, 0.4, 0.5, 0.6, 0.8) bei 1173 K, für den Schnitt Ag0.5Bi0.5–Te bei 1073 K und zur Vervollstandigung älterer Ergebnisse für den Schnitt Ag0.5Sb0.5–Te bei 1073 und 1173 K bestimmt. Die thermodynamischen Funktionen der Systeme Ag–Sb, Ag–Bi und Ag-Te wurden erneut mit Hilfe der Lukas-Programme unter Verwendung des Assoziat-Modells optimiert. Fur die analytische Beschreibung der Exzeßenthalpien der ternaren Systeme mußten zusätzliche ternäre Wechselwirkungs-parameter verwendet werden. Die Enthalpie-Flächen der Systeme werden durch Minimarinnen der exothermen Enthalpien bestimmt, die sich zwischen den kongruent schmelzenden Verbindungen der binären Systeme er-strecken. Der exotherme Charakter der Mischungsenthalpien nimmt mit steigender Temperatur ab, was auf die Dis-soziation der in den binären Schmelzen gebildeten Assoziate zürückzufuhren ist.

Keywords: Liquid alloys; Ag–Sb–Te and Ag–Bi–Te; Excess enthalpy of liquid alloys; Association model; Thermodynamic functions; Ag–Sb; Ag–Bi and Ag–Te alloy systems; Systems; Ag–Bi; Ag–Te
R. Blachnik Institut für Chemie Barbarastr. 7, D-49069 Osnabrück, Germany Fax: +49 54 1969 3323

Dedicated to Professor Dr. Dr. h. c. Hein Peter Stuéwe on the occasion of his 70th birthday

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Published Online: 2021-12-09

© 2001 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Metalle und Zeit – eine oft vergessene Problematik
  6. Precipitate Size Distribution in Alloys with and without Lattice Misfit
  7. The Ternary Ga–Ni–Sb System: Invariant Reactions and Liquidus Surface
  8. Thermodynamic Calculation of Al-Gd and Al-Gd-Mg Phase Equilibria Checked by Key Experiments
  9. Assessment of Diffusional Mobilities of Cr, Ni, and Si in fcc Cr–Ni–Si Alloys
  10. Quantitative Dilatometric Analysis of the Isothermal Decomposition of Hypereutectoid Fe–C Austenite
  11. The Excess Enthalpies of Liquid Ag-Sb-Te and Ag-Bi-Te Alloys
  12. Temperature Dependent Surface Tension of Binary Alloys: A Simple Model
  13. Micro-hardness Measurements to Evaluate Composition Gradients in Metal-Based Functionally Graded Materials
  14. Temperature Dependence of Lattice Parameter, Misfit and Thermal Expansion Coefficient of Matrix, γ′ Phase and Superalloy
  15. Einfluss der Umformgeschwindigkeit und -temperatur auf die Versagensgrenze von Aluminium AA7075
  16. Phenomenological and Microscopical Description of Scattering on Different Dislocation Arrangements
  17. Creep and Dislocation Structure in Copper Single Crystals Compressed in Directions [010], [110] and [111]
  18. Analysis of Average Orientation Distribution in Sheet Materials with Through-Thickness Texture Gradient
  19. Instructions to Authors/Hinweise für Autoren
  20. Instructions to authors
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  22. Personen
  23. Buchbesprechung
  24. Tagungskalender
https://doi.org/10.3139/ijmr-2001-0008
Keywords for this article
Liquid alloys; Ag–Sb–Te and Ag–Bi–Te; Excess enthalpy of liquid alloys; Association model; Thermodynamic functions; Ag–Sb; Ag–Bi and Ag–Te alloy systems; Systems; Ag–Bi; Ag–Te

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Metalle und Zeit – eine oft vergessene Problematik
  6. Precipitate Size Distribution in Alloys with and without Lattice Misfit
  7. The Ternary Ga–Ni–Sb System: Invariant Reactions and Liquidus Surface
  8. Thermodynamic Calculation of Al-Gd and Al-Gd-Mg Phase Equilibria Checked by Key Experiments
  9. Assessment of Diffusional Mobilities of Cr, Ni, and Si in fcc Cr–Ni–Si Alloys
  10. Quantitative Dilatometric Analysis of the Isothermal Decomposition of Hypereutectoid Fe–C Austenite
  11. The Excess Enthalpies of Liquid Ag-Sb-Te and Ag-Bi-Te Alloys
  12. Temperature Dependent Surface Tension of Binary Alloys: A Simple Model
  13. Micro-hardness Measurements to Evaluate Composition Gradients in Metal-Based Functionally Graded Materials
  14. Temperature Dependence of Lattice Parameter, Misfit and Thermal Expansion Coefficient of Matrix, γ′ Phase and Superalloy
  15. Einfluss der Umformgeschwindigkeit und -temperatur auf die Versagensgrenze von Aluminium AA7075
  16. Phenomenological and Microscopical Description of Scattering on Different Dislocation Arrangements
  17. Creep and Dislocation Structure in Copper Single Crystals Compressed in Directions [010], [110] and [111]
  18. Analysis of Average Orientation Distribution in Sheet Materials with Through-Thickness Texture Gradient
  19. Instructions to Authors/Hinweise für Autoren
  20. Instructions to authors
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  22. Personen
  23. Buchbesprechung
  24. Tagungskalender
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