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Thermodynamic Properties of Alloys of Phosphorus with Calcium, Barium, Chromium, Manganese and Iron

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Published/Copyright: November 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 88 Issue 1

Abstract

Knudsen effusion mass-spectrometry has been applied to study the thermodynamic properties of alloys of with Ca, Ba, Cr, Mn and Fe in the solid and liquid state. Evaporation was accompanied by decomposition of the alloys to the components. Complex molecules (FeP and Fe2P) were discovered only over Fe–P alloys. In addition to the Knudsen experiments heat capacities of some phosphides were obtained in the temperature range of 113 to 873 K using a DSC thermal analyzer. The absolute entropies of the phosphides calculated according to the second and the third law of thermodynamics agreed within the limits of experimental error. The thermodynamic properties of the melts were approximated by the associated-solution model. The Gibbs energies of formation of the associative complexes were found to correlate with those of the phosphides. Both these functions altered in accordance with the electronegativity of the metal component. The calculated phase diagrams of the studied systems are in good agreement with published data.

Abstract

Thermodynamische Eigenschaften der P-Legierungen mit Ca, Ba, Cr, Mn und Fe sind mit Hilfe der Knudsen-Effusions-Massen-Spektrometrie untersucht worden. Bei der Legierungsverdampfung erfolgt die Zerlegung in die Komponenten. Kompliziertere Moleküle (FeP und Fe2P) wurden nur im Dampf über den Fe–P-Legierungen beobachtet. In Ergänzung zum Knudsen-Versuch wurden Wärmekapazitätsmessungen von einigen Phosphiden im Temperaturbereich von 113 bis 873 K mit einem DSC-Thermoanalysator drchgeführt. Die nach dem zweiten und dritten Gesetz der Thermodynamik berechneten absoluten Entropien der Phosphide entsprechen einander im Rahmen der experimentellen Fehler. Die thermodynamischen Eigenschaften der Schmelzen wurden mit dem Modell der assoziierten Lösungen beschrieben. Die Gibbs-Energien der Entstehung der assoziativen Komplexe korrelieren mit den Gibbs-Energien der Phosphiden. Beide Funktionen verändern sich entsprechend der Elektronegätivität der Metalle. Die berechneten Phasendiagramme der untersuchten Systeme stimmen gut mit bisher veröffentlichten Daten überein.

Alexander I. Zaitsev, Alexandra D. Litvina, Natalia E. Shelkova, B.M. Mogutnov Institute for Physical Metallurgy I.P. Bardin Central Research Institute for Iron and Steel Industry 9/23 2nd Baumanskaya Moscow 107005, Russia Zhanna V. Dobrokhotova N.S. Kurnakov Institute for General and Inorganic Chemistry 31 Leninskii prospect Moscow 117071, Russia

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Received: 1996-02-09
Published Online: 2021-11-09

© 1997 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Systematical Calculation of the Chemical Driving Force for Precipitation Reactions in Binary Alloys
  6. 10.3139/ijmr-1997-0003
  7. Multi-Step Hot Working of Al-5 wt.% Mg
  8. Young’s Modulus of Cast-Iron as a Function of Volume Content, Shape and Orientation of Graphite Inclusions
  9. Die Charakterisierung homogener polyedrischer Gefüge mit Hilfe des räumlichen Poisson-Voronoi-Mosaiks und der Vergleich zur DIN 50 601
  10. 10.3139/ijmr-1997-0007
  11. Internal Oxidation of Rapidly Solidified Cu–Zr Alloys
  12. Phase Diagram Investigation and Thermodynamic Evaluation of the Thallium–Tellurium System
  13. Thermodynamic Assessment of the Nb–W–C System
  14. Thermodynamic Properties of the Nb–W–C–N System
  15. 10.3139/ijmr-1997-0012
  16. 10.3139/ijmr-1997-0013
  17. Phase Equilibria in the γ′-Rich Region of the Ni –Al –Hf System
  18. Phase Equilibria in the γ′-Rich Region of the Boron-doped Ni –Al –Hf System
  19. Instructions for Authors
  20. Zeitschrift für metallkunde
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V
  22. Personen
  23. Bericht aus dem DGM-Fachausschuß Strangpressen
  24. Fortbildung
https://doi.org/10.3139/ijmr-1997-0013

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Aufsätze
  5. Systematical Calculation of the Chemical Driving Force for Precipitation Reactions in Binary Alloys
  6. 10.3139/ijmr-1997-0003
  7. Multi-Step Hot Working of Al-5 wt.% Mg
  8. Young’s Modulus of Cast-Iron as a Function of Volume Content, Shape and Orientation of Graphite Inclusions
  9. Die Charakterisierung homogener polyedrischer Gefüge mit Hilfe des räumlichen Poisson-Voronoi-Mosaiks und der Vergleich zur DIN 50 601
  10. 10.3139/ijmr-1997-0007
  11. Internal Oxidation of Rapidly Solidified Cu–Zr Alloys
  12. Phase Diagram Investigation and Thermodynamic Evaluation of the Thallium–Tellurium System
  13. Thermodynamic Assessment of the Nb–W–C System
  14. Thermodynamic Properties of the Nb–W–C–N System
  15. 10.3139/ijmr-1997-0012
  16. 10.3139/ijmr-1997-0013
  17. Phase Equilibria in the γ′-Rich Region of the Ni –Al –Hf System
  18. Phase Equilibria in the γ′-Rich Region of the Boron-doped Ni –Al –Hf System
  19. Instructions for Authors
  20. Zeitschrift für metallkunde
  21. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V
  22. Personen
  23. Bericht aus dem DGM-Fachausschuß Strangpressen
  24. Fortbildung
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