title: Sn-Ag-Cu nanosolders: Melting behavior and phase diagram prediction in the Sn-rich corner of the ternary system.
abstract: Melting temperatures of Sn-Ag-Cu (SAC) alloys in the Sn-rich corner are of interest for lead-free soldering. At the same time, nanoparticle solders with depressed melting temperatures close to the Sn-Pb eutectic temperature have received increasing attention. Recently, the phase stability of nanoparticles has been the subject of plenty of theoretical and empirical investigations. In the present study, SAC nanoparticles of various sizes have been synthesized via chemical reduction and the size dependent melting point depression of these particles has been specified experimentally. The liquidus projection in the Sn-rich corner of the ternary SAC system has also been calculated as a function of particle size, based on the CALPHAD-approach. The calculated melting temperatures were compared with those obtained experimentally and with values reported in the literature, which revealed good agreement. The model also predicts that with decreasing particle size, the eutectic composition shifts towards the Sn-rich corner.
authors.affiliation: Department of Inorganic Chemistry (Materials Chemistry), University of Vienna, A-1090 Vienna, Austria.
authors.forename: Ali
authors.initials: A
authors.lastname: Roshanghias
authors.affiliation: Masaryk University, CEITEC MU, Brno, Czech Republic.
authors.forename: Jan
authors.initials: J
authors.lastname: Vrestal
authors.affiliation: Department of Inorganic Chemistry (Materials Chemistry), University of Vienna, A-1090 Vienna, Austria.
authors.forename: Andriy
authors.initials: A
authors.lastname: Yakymovych
authors.affiliation: Department of Inorganic Chemistry (Materials Chemistry), University of Vienna, A-1090 Vienna, Austria.
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Richter
authors.affiliation: Department of Inorganic Chemistry (Materials Chemistry), University of Vienna, A-1090 Vienna, Austria.
authors.forename: Herbert
authors.initials: H
authors.lastname: Ipser
keywords: CALPHAD; Lead free solders; Melting point depression; Nanoparticles; Size effect