The Ag-Bi (Silver-Bismuth) System

Abstract

The solid solubility of Bi in (Ag) was estimated to be -3 at.% on the basis of X-ray work [31Bro]. Lattice parameter measurements of alloys at the temperature extremes of 200 and 259 ~ yielded solubilities of 0.312 and 0.784 at.% B i, respectively [40Chi]. More extensive studies of Bi solubility involving both micrographic and lattice parameter measurements between 266 and 900 ~ were conducted by [46Rau]. Bi solubility in (Ag) was studied by thermoelectric power and lattice parameter measurements over the temperature range 300 to 900 ~ [75Gla, 83Ako]. Recently, electron probe microanalysis (EPMA) of the Ag-rich phase quenched from 650 to 925 ~ in the two-phase region was reported [88Sch]. The solidus and solvus lines for the Ag side recommended in this evaluation are compared with all of the foregoing reported data in Fig. 3. The solidus line through the data points is based mainly on estimated thermodynamic data for the Ag solid solution. This is discussed in the "Thermodynamics" section. The projected solubility of Bi at 30 ~ is 0.004 at.%. On this basis, it appears that the solubility of 0.16 at.% reported by thermoelectric power measurement by [67Poi] at 30 ~ is excessive.