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Thermodynamic characterization of liquid alloys with demixing tendency: Bi–Ga

  • Beatrix Huber , Klaus W. Richter , Hans Flandorfer , Adolf Mikula and Herbert Ipser
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 1

Abstract

The system Bi – Ga shows a pronounced miscibility gap in the liquid state ranging from 38.5 to 91.5 at.% Ga at 495 K with a maximum at 535 K at about 70 at.% Ga.

Heat capacities of liquid Bi – Ga alloys were determined by heat flow differential scanning calorimetry over the entire composition range at temperatures between 520 and 600 K. In order to optimize the differential scanning calorimetry measurements in the liquid state, the sample masses were increased to 250–400 mg and the heating and cooling rates were reduced to 10 or 5 K min−1, respectively. The experimental results show a positive deviation from the Neumann-Kopp rule in the composition range of the miscibility gap. The results are in good agreement with theoretical considerations.

Additionally, enthalpies of mixing were determined by drop calorimetry in the composition range from 30 to 100 at.% Ga at three different temperatures: 513, 573 and 673 K.

Keywords: Bi – Ga; DSC; Heat capacities; Drop calorimetry; Enthalpy of mixing
* Correspondence address, Dr. Klaus W. Richter, Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria, Tel.: +431 4277 52910, Fax: +431 4277 9529, E-mail:

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Received: 2007-1-19
Accepted: 2007-9-7
Published Online: 2013-06-11
Published in Print: 2008-01-01

© 2008, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101601
Keywords for this article
Bi – Ga; DSC; Heat capacities; Drop calorimetry; Enthalpy of mixing

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr.-Ing. habil. Dr.-Ing. E. h. Werner Schatt zum 85. Geburtstag
  5. Basic
  6. In-situ reaction synthesis and decomposition of Ta2AlC
  7. A new theoretical equation for temperature dependent self-diffusion coefficients of pure liquid metals
  8. Thermodynamic characterization of liquid alloys with demixing tendency: Bi–Ga
  9. Space charge effects in confined ceramic systems
  10. Solute transport and phase composition in an Al–Mg–Si alloy solidified under conditions of forced flow
  11. Evidence of α → ω phase transition in titanium after high pressure torsion
  12. Thermodynamic properties and elastic constants of Nd–Mg intermetallics: a molecular dynamics study
  13. Microstructure, texture and mechanical properties of the magnesium alloy AZ31 processed by ECAP
  14. Applied
  15. Effect of solidification microstructure and Ca additions on creep strength of magnesium alloy AZ91 processed by Thixomolding
  16. Magnetic hardening mechanism of PrCo5-based ribbons with C addition prepared by melt spinning
  17. Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe
  18. Microstructural characteristics and elevated temperature wear of Ti-11Si-16Al alloy
  19. Nickel coating on some organic and carbon fibres by chemical plating
  20. Wear and corrosion properties of nanocrystalline coatings on stainless steel produced by plasma electrolytic nitrocarburizing
  21. The characterisation of microstructural changes in rapidly solidified Al–Fe alloys through measurement of their electrical resistance
  22. Solid inclusion cakes formed during pressure filtration tests of liquid aluminum alloys
  23. Performance of Ni/YSZ cermet cathode prepared by mechanical alloying for high temperature electrolysis of water vapor (steam): effect of anode and cathode thicknesses on the efficiency of hydrogen production
  24. Review
  25. Practical aspects and implications of interfaces in glass-ceramics: a review
  26. Notifications
  27. DGM News
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