Phase equilibria in the ternary Ag-Au-Ga system: Isothermal sections at 250°C and 450°C

Abstract

The ternary Ag-Au-Ga system seems to be interesting in jeweller's craft as a joint. Moreover, the ternary systems based on gold and silver have found applications in the dental industry. A literature overview of the Ag-Au-Ga system shows that the information about phase equilibria of this system does not exist. In the present work, phase equilibria in the Ag-Au-Ga ternary system have been studied by using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) analysis and X-ray diffraction analysis (XRD). Twenty two annealed alloys in the 10-70 at.% Ga region have been investigated. Obtained experimental results were compared with the predicted isothermal sections at two temperatures (250 °C and 450 °C). No ternary compounds are found.

Understanding GaAs Nanowire Growth in the Ag–Au Seed Materials System

“…The Au–Ga and Ag–Ga materials systems are well studied and phase diagrams as well as mixing enthalpies are readily available. However, for the AgAu-Ga pseudobinary no such diagram was available and initial studies on the ternary system have only recently become published. , Therefore, a preliminary phase diagram was created for the AgAu-Ga system, based on available data. A thermodynamic database was constructed using the collected data from studies on the three binary systems, Ag–Au, Ag–Ga, and Au–Ga .…”

DTA measurements in the ternary Ag-Au-Ga system

“…Experimental DTA results obtained in the present work together with the other existing experimental results [22,23,26] will be used in the near future in the final optimization of the phase diagram of the ternary Ag-Au-Ga system by applying the CALPHAD method.…”

“…Next, the experimental data which were obtained from the calorimetric and EMF measurements [22,23] were used in the optimization of liquid phase in this ternary Ag-Au-Ga system by using the CALPHAD method [24,25]. Finally, in the subsequent work by Jendrzejczyk-Handzlik [26], the phase equilibria in the ternary Ag-Au-Ga system were established for two isothermal sections at 523 K and 723 K by applying SEM/EDS and XRD analysis to the equilibrated samples. No ternary compounds were found.…”

“…Thermodynamic properties and phase equilibrium data for three binary systems Ag-Au [27], Au-Ga [28] and Ag-Ga [29,30] have been studied and can be found in the literature. They are described in details in the previous work [26].…”

“…At first, this prediction was based on the existing information about the assessed binary systems: Ag-Au [27], Au-Ga [28], and Ag-Ga [30]. The binary thermodynamic parameters used for the prediction of phase equilibria in the ternary Ag-Au-Ga system were taken from the previous work [26]. Then, a new set of thermodynamic parameters for the liquid phase of the Ag-Au-Ga system was evaluated by using the following experimental data taken from the literature: the heat of mixing data obtained along two crosssections where x Ag /x Ga =1:1 and x Au /x Ga =1:1 at two temperatures 1223 K and 1323 K [22], the activities of gallium determined from the EMF method by using solid oxide electrolyte in the temperature range from 1023 to 1348 K [23], as well as the experimental data taken from the present work.…”