The AuSn phase diagram

Ciulik, J.; Notis, Michael R.

doi:10.1016/0925-8388(93)90273-p

Cited by 79 publications

(49 citation statements)

References 12 publications

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“…The choice of the step cool down process and temperature was driven by the existence of a small Sn precipitation window at the lowest eutectic, near the Sn rich side of the binary bulk Au-Sn phase diagram [64], at around 215-230 ºC. Although there is a large lattice mismatch between the components (Ge and Sn) of the alloy, the epitaxial mismatch in the nanowires with a large influx of Sn is compensated by elastic deformation near the hetero-interface and relieved at the nanowire surfaces, thus maintaining highly crystalline nanowires (Figure 5b).…”

Section: Ge Sn (A) (B)mentioning

confidence: 99%

Inducing imperfections in germanium nanowires

2017

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Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin Heidelberg2017. This is a pre-print of an article published in Nano Research. and/or interfacial manipulation. An "epitaxial defect transfer" process and catalyst-nanowire interfacial engineering is employed to induce twin defects parallel and perpendicular to the nanowire growth axis. By inducing and manipulating twin boundaries in the metal catalysts, twin formation and density is controlled in Ge nanowires. The formation of Ge polytypes is also observed in nanowires for the growth of highly dense lateral twin boundaries.Additionally, metal impurity, in the form of Sn, is injected and engineered via third-party metal catalysts resulting above-equilibrium incorporation of Sn adatoms in Ge nanowires. Sn impurities are precipitated into Ge bi-layers during Ge nanowire growth, where the impurity Sn atoms become trapped with the deposition of successive layers, thus giving an extraordinary Sn content (> 6 at.%) in the Ge nanowires. A larger amount of Sn impingement (> 9 at.%) is further encouraged by the utilising eutectic solubility of Sn in Ge along with the impurity trapping.

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Section: Ge Sn (A) (B)mentioning

confidence: 99%

Inducing imperfections in germanium nanowires

2017

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“…The two endothermic peaks are determined at about 190.1°C and 290°C. The first peak corresponds to the reverse peritectoid reaction ζ′+δ→ζ or ζ′→ζ+δ depending on the local Sn concentration [11][12][13]; the second peak corresponds to the melting reaction. The endothermic reaction around 190°C implies that the ordered-disordered transition ζ′→ζ is a first order phase transition.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, initial microstructure of the bulk AuSn20 alloy plays an important role in the rolling process. According to Au-Sn binary alloy phase diagram [11][12][13] as shown in Fig. 1, AuSn20 alloy should reveal a eutectic microstructure consisting of ζ′-Au 5 Sn phase and δ-AuSn phase at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Evolution of primary phases and high-temperature compressive behaviors of as-cast AuSn20 alloys prepared by different solidification pathways

et al. 2011

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The as-cast AuSn20 eutectic alloys prepared by four different solidification pathways have been investigated in terms of the microstructure and the high-temperature compressive behaviors. The primary phases appeared in the four alloys are very sensitive to the cooling rate, which decrease in the size and the volume fraction as the cooling rate increases. The morphologies of the primary ζ′-Au 5 Sn phase are in dendritic at low cooling rate and change to rosette-like at high cooling rate. When the cooling rate is about 3.5× 10 4 K/min, the primary ζ′-Au 5 Sn can be suppressed but small δ-AuSn particles appear instead as the primary phase. The compressive behaviors at 220°C exhibit a low yielding stress and a long stress platform for the alloy prepared by injection casting with a copper crucible, which indicates an advantageous processing route for the production of the AuSn20 strips or foils.

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“…This could be due to the local rejection of gold atoms from Sn-rich region of the interface because of the extremely limited solid solubility [16]. It was therefore possible to have partial melting locally or the existence of fine gold-rich precipitates inside almost pure tin matrix.…”

Section: Cross-sectional Microstructurementioning

confidence: 99%

Microstructural and Diffusion Analysis of Au-Sn Diffusion Couple Layer Undergoing Heat Treatment at Near Eutectic Temperatures

Darayen¹,

Athichalinthorn²,

Techapiesancharoenkij³

et al. 2017

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Abstract. Diffusion couples of pure gold and pure tin were created by mechanical cold rolling method. The couples were isothermally treated at temperatures slightly above and below the eutectic temperature near tin-rich region of the equilibrium phase diagram. Differences in the diffusion behaviors were observed as a function of treatment temperatures below (473 K) and above (498 K) the eutectic temperature. At the boundary, it was found that first solid state inter-diffusion was initiated which resulted in local compositional change and solid-state formation of intermetallic compounds (IMCs). As the composition shifts away towards mixing, the growth of the intermetallic phases was monitored as a function of temperature and time. At temperature above the eutectic, there may be a liquid fraction as the interface isothermally melted. The kinetic involves dissolution of Au atoms into localized tin-rich liquid. At below eutectic temperature, the formation and growth kinetic of phases follows a solid state diffusion mechanism. By investigation the exponent n values in the growth equation l=k(t/t0)n, the values were found to be in between 0.62 -0.77 which implies that the kinetics of IMC formations experiment are controlled by both diffusion and intermetallic reaction. The bonding time was found to be faster and more reliable at bonding temperature slightly above the eutectic.

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The AuSn phase diagram

Cited by 79 publications

References 12 publications

Inducing imperfections in germanium nanowires

Inducing imperfections in germanium nanowires

Evolution of primary phases and high-temperature compressive behaviors of as-cast AuSn20 alloys prepared by different solidification pathways

Microstructural and Diffusion Analysis of Au-Sn Diffusion Couple Layer Undergoing Heat Treatment at Near Eutectic Temperatures

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