Thermodynamic assessment of the Ag-Au-Bi and Ag-Au-Sb systems

A Kinetic Monte Carlo model for material aging: Simulations of second phase formation at Au/Bi2Te3 junction in oxygen environments

“…Using eV/atom as the unit for G name , the b i parameters are listed in Table II. The experimental data for Gibbs free energy for solid solution A x 1 B x 2 ::: x n as a function of composition are well described by Redlich-Kister polynomial expansion: [6][7][8] G A x 1 B x 2 ::…”

“…No values have been determined for parameters L AuTe , L AuO , L TeBi , L TeO , and L BiO . 7,8 However, L ij reflects the Gibbs free energy of formation (DG) of the binary systems shown in Fig. 2, as negative DG and L ij values both indicate strong i-j bonds and positive DG and L ij values both indicate weak i-j bonds.…”

Verification of Phase Diagrams by Three-Dimension Computer Models

“…Ag-Au-Bi: Despite the fact that the information, placed into the atlas, was thoroughly checked (according to its authors), the description of the Ag-Au-Bi system is contradictory: in the binary system Au-Bi, cited according to the data [14][15][16][17][18][19], the compound Au 2 Bi decomposes at the temperature 110°C, whereas the solid solution on its basis in the ternary system isopleths exists also at 0°C (Figures 4c and 4d). To understand these contradictions, it is necessary to discuss the papers [14][15][16][17][18], the information from which in the form of an isothermal section and four isopleths were included into the atlas.…”

“…To understand these contradictions, it is necessary to discuss the papers [14][15][16][17][18], the information from which in the form of an isothermal section and four isopleths were included into the atlas. The Ag-AuBi=A-B-C T-x-y diagram has a simple geometric construction.…”

“…There is no contradictions of the 3D model and the published sections, including the isothermal section at T<T Q in both versions and the high-temperature part of the T-x-y diagram (higher than reaction Q at T Q =251.9°C). If the compound Au 2 Bi decomposes, the versions of the 20 at % Ag isopleth, published in [12] (Figure 4c) and [17,18] (Figure 5d-f), are reproduced by the 3D model, where the section S 1 S 2 of the three-phase region, designated in [12] as FCC1_A1+RHOMBO_A7+AU2BI_ C15, is bounded by curves 6-8 and 7-9 ( Figure 5e (to notate the boundaries of the three-phase region with a phase reaction R→A(B)+C without liquid, the superscript "R" is added) through curves 7-8 and 6-8. The last are the boundaries of the three-phase region Ag(Au)+Bi+Au 2 Bi=A(B)+C+R (Figure 5f).…”