Crystalline Surface Phases of the Liquid Au-Si Eutectic Alloy

Details Crystalline Surface Phases of the Liquid Au-Si Eutectic Alloy Crystalline Surface Phases of the Liquid Au-Si Eutectic Alloy

2007-02-17

arxiv.org/abs/cond-mat/0702413v2

Physics

Condensed Matter

Materials Science

10 pages, 8 figures

Scientific paper

10.1103/PhysRevB.76.245436

A two dimensional crystalline layer is found at the surface of the liquid eutectic Au$_{82}$Si$_{18}$ alloy above its melting point $T_M=359 ^{\circ}$C. Underlying this crystalline layer we find a layered structure, 6-7 atomic layers thick. This surface layer undergoes a first-order solid-solid phase transition occurring at $371 ^{\circ}$C. The crystalline phase observed for T$>$371 $^{\circ}$C is stable up to at least 430 $^{\circ}$C. Grazing Incidence X-ray Diffraction data at T$>$371 $^{\circ}$C imply lateral order comprising two coexisting phases of different oblique unit cells, in stark contrast with the single phase with a rectangular unit cell found for low-temperature crystalline phase $359 ^{\circ}$C$

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