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Thermodynamic description of the ternary Pd–Sn–Zn system

  • Zuoan Li , Sabine Knott and Adolf Mikula
Published/Copyright: March 1, 2013

Abstract

The thermodynamic properties of the liquid Pd–Sn–Zn ternary system were investigated, because the Sn–Zn alloy is a promising lead-free solder and Pd can be used as a substrate material. Using an appropriate galvanic cell, the partial free energies of Zn in liquid Pd–Sn–Zn alloys were determined as a function of concentration and temperature. Thermodynamic properties were obtained for 18 alloys. Their composition was situated on two cross-sections with the constant molar ratios of Pd: Sn = 1:3 and 1:9. The integral Gibbs free energy and the integral enthalpy for the ternary system at 1000 K were calculated by Gibbs–Duhem integration. For the liquid binary Pd–Sn system, some inconsistencies were found in previous CALPHAD results. Considering the latest experimental information, the interaction parameters of the liquid phase were reevaluated. The liquidus temperatures were also determined from EMF measurements.


2 Correspondence address: Mag. Dr. Sabine Knott, Institut für Anorganische Chemie–Materialchemie, Universität Wien, Währinger Straße 42, A-1090 Wien, Austria, Tel.: +43 1 4277 52913, Fax: +43 1 4277 9529. E-mail:

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Received: 2007-05-02
Accepted: 2007-11-22
Published Online: 2013-03-01
Published in Print: 2008-02-01

© 2008, Carl Hanser Verlag, Munich

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