STUDIES ON BISMUTH ALLOYS. I. LIQUIDUS CURVES OF THE BISMUTH—COPPER, BISMUTH—SILVER, AND BISMUTH—GOLD SYSTEMS¹

Abstract

The liquidus curves of the Bi-Cu, Bi-hg, and Bi-Au systems Rere redetermined by a sampling method.The eutectic was determined to be at 270.6 f 0.1" at 0.46 atom % copper (0.14 wt. 70).The Bi-Ag The eutectic was found at 262.5 & 0.2" a t 4.95 rt The Bi-Cu liquidus agrerd fairly well with Kleppa's data over the range investigatedThe Bi-Au liquidus Below the peritectic temperature, a completely new liquidus The peritectic was found at 371 rt 2" by means of differential thermal analysis, the composition The The results curve nas somewhat shifted from the previously determined location. 0.05 atom 70 silver (2.62 wt. 70). by him. did not agree well with the few experimental data available. curve was established.being 23.1 atom yo gold (24.1 at. 70).heats of fusion of the four elements agreed reasonably well with the literature values, except that of bismuth. show that the sampling method is, for many cases, well adapted for the determination of liquidus curves.The eutectic is a t 13.4 =t 0.2 atom %;o gold (14.1 wt. yo) at 241.5 =k 0.5'.

Phase equilibria in the Ag–Au–Bi ternary system

“…[10], the equilibrium phases of the Ag-Bi system under the present experimental condition are the liquid one L and two solid ones (Ag) and (Bi). The tem- [11,15]. perature of the eutectic reaction, T e 1 = 262.5 • C, that we measured, agrees well with the one reported by the previous referred author.…”

Thermodynamic Modeling of the Au-Bi-Sb Ternary System

“…Recently, Evans et al 24 and Zoro et al 19 determined the phase boundary of liquid phase using thermal analysis. The phase boundaries determined by Nathans, 22 Evans et al, 24 and Zoro et al 19 are generally in good agreement with the results reported by Vogel, 25 except for the part between the peritectic and eutectic reactions due to the absence of intermediate compound Au 2 Bi. Therefore, experimental data reported by Nathans, 22 Evans et al, 24 and Zoro et al 19 were used in the present optimization, while those reported by Vogel 25 were given up.…”

“…20,21 rhombohedral_A7(Bi), and intermediate compound Au 2 Bi, and two invariant reactions, peritectic reaction (liquid + fcc_A1(Au) M Au 2 Bi) and eutectic reaction (liquid M rhombohedral_A7(Bi) + Au 2 Bi), can occur. Nathans 22 and Gather et al 23 have determined the temperature and composition of the peritectic reaction, which are mutually consistent. However, the determined peritectic temperatures are lower than those reported later by Evans et al 24 and Zoro et al 19 In addition, Nathans, 22 Gather et al, 23 Evans et al, 24 and Zoro et al 19 have also determined the eutectic temperature and composition.…”

“…Nathans 22 and Gather et al 23 have determined the temperature and composition of the peritectic reaction, which are mutually consistent. However, the determined peritectic temperatures are lower than those reported later by Evans et al 24 and Zoro et al 19 In addition, Nathans, 22 Gather et al, 23 Evans et al, 24 and Zoro et al 19 have also determined the eutectic temperature and composition. Data about the eutectic reaction from are in good agreement with each other.…”

Contribution à l’étude expérimentale du système ternaire Bi-Cu-I : Description du triangle CuI-BiI3-I

“…Le système binaire Cu-Bi présente un diagramme de phases très simple avec un eutectique dégénéré sur le côté bismuth (99.5 at.% Bi) [6,7]. L'étude de quelques échantillons choisis dans le binaire Cu-Bi a confirmé l'allure générale donnée dans les travaux antérieurs avec une légère différence en température pour l'eutectique et le liquidus ( Figure 1).…”