Thermodynamic properties of the liquid Ge-Cu and Ge-Au systems by mass spectrometry

Details Thermodynamic properties of the liquid Ge-Cu and Ge-Au systems by mass spectrometry Thermodynamic properties of the liquid Ge-Cu and Ge-Au systems by mass spectrometry

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973slsci...4.2383h&link_type=abstract

Metallurgical Transactions, Volume 4, Issue 10, pp.2383-2388

Computer Science

Scientific paper

The activities and partial molar heats of mixing have been determined for the liquid Ge-Cu system at 1525°C and the liquid Ge-Au system at 1400°C. The experimental technique consisted of analyzing Knudsen cell effusates with a TOF mass spectrometer. The ion current ratios for the monomeric vapor species were measured as a function of temperature and composition and the thermodynamic properties calculated using a modified form of the Gibbs-Duhem equations. Both systems exhibited negative deviations from ideal behavior. The results for the Raoultian activity coefficients can be partially represented by begin{gathered} log γ _{Ge} = - 2.521X_{Cu}^2 + 0.948 (0 ≤slant X_{Ge} ≤slant 0.2) \ log γ _{Cu} = - 0.048X_{Ge}^2 - 0.466 (0 ≤slant X_{Cu} ≤slant 0.2) \ for the Ge-Cu system at 1525°C and by begin{gathered} log γ _{Ge} = - 2.327X_{Au}^2 + 0.465 (0 ≤slant X_{Ge} ≤slant 0.35) \ log γ _{Au} = - 0.510X_{Ge}^2 - 0.489 (0 ≤slant X_{Au} ≤slant 0.30) \ for the Ge-Au system at 1400°C. An experimental technique is presented for determining the contribution of dissociative ionization of polymer species to the measured monomeric ion current ratio . The effect of dissociative ionization of the germanium polymer species present in the Knudsen ceil effusate was determined to be negligible.

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