The equilibrium diagram of the system gold-indium

Abstract

The equilibrium diagram of the system Au-In has been examined in great detail by a combination of thermal, microscopical, and X-ray techniques. The results are discussed in connexion with the general theory of the alloys of Cu, Ag, and Au with the B sub-group elements. On the gold-rich side of the diagram, the α solid solution in gold is succeeded by an α 1 hexagonal phase with random ABAC... stacking, and this in turn is succeeded by a normal ﻉ close-packed hexagonal phase with ABAB ... stacking, which is followed by ordered hexagonal phases. There is then a typical ˠ phase with the ˠ brass structure, and a newly discovered ψ phase which is remarkable for the very slight maximum in the liquidus curve. In terms of electron concentration limits, the ﻉ Au-In phase differs from the ﻉ Au-Sn and ﻉ Au-Sb phases, but resembles that of the Au-Cd ﻉ phase (previously called α 2 ). There is, however, a remarkable difference between the Au-Cd and A u-In ﻉ phases, in that in the latter there is a clear division between the phases with ABC ABC..., ABAC..., and . stacking, whereas in AuCd alloys heavily faulted structures are found.

Free-Standing InAs Nanobelts Driven by Polarity in MBE

“…The quantitative EDS analysis on over a dozen nanobelt catalysts indicates that the In concentration of the nanobelt catalysts ranges from 11 to 14 atom %, which is in excellent agreement with the hexagonal structured Au–In ξ phase determined by our crystallographic analysis. Additionally, according to the Au–In phase diagram, the nanobelt catalysts should be in the solid phase at the growth temperature (300 °C), which is consistent with our observation that all nanobelt catalysts are faceted . Interestingly, our previous studies ,, found that solid catalysts may have an epitaxial relationship with their underlying nanostructures so that we explore possible orientation relationship between the nanobelts and their solid catalysts.…”

“…Figure a is the BF TEM image of an individual InAs nanobelt and Figure b shows the HRTEM image of its top region, showing the (001̅) nanobelt/catalyst interface, and Figure c shows the corresponding superimposed SAED pattern. By analyzing the acquired SAED pattern, the nanobelt catalyst can be determined to be in the hexagonal structured Au–In alloy ξ phase ( a = 0.290 nm and c = 0.478 nm) . To examine the chemical composition of the faceted catalyst and its underlying nanobelt, EDS point analysis was performed and corresponding results are presented in Figure d, suggesting that the catalysts contain Au and In (Cu signal coming from the Cu grids for TEM analysis) and the nanobelts are indeed InAs.…”

Quality of epitaxial InAs nanowires controlled by catalyst size in molecular beam epitaxy

“…Our detailed SAED analysis indicates that the faceted catalyst is the hexagonal-close-packed structured Au-In n phase with lattice parameters of a ¼ 0.290 nm and c ¼ 0.478 nm. 25 To confirm the composition of the catalyst and its underling nanowire, EDS analysis was performed and results are shown in Fig. 2(d), in which the catalyst contains Au and In.…”

Ternary intermetallic compounds in Au–Sn soldering systems—structure and properties

“…First, it can be stated that the addition of Sb to AuSn decreases the melting temperature from 692 to 652 K, while extra In increases the melting temperature to 725 K [52]. Second, the occurrence of extra peaks in the first cooling cycle corresponds to a partial decomposition to the binary phase AuSn, as well as the formation of Sb-doped Au 5 Sn [53] and a solid solution of Sn in AuSb 2 [54] in the Au 6 Sn 5 Sb sample, while Sn-doped Au 3 In phase [55] is present as a minor phase in the Au 3 InSn 2 sample (Figs. 17 and 18; Table 4).…”