Phys. Rev. B 76, 245436 (2007) [9 pages]Crystalline surface phases of the liquid Au-Si eutectic alloyReceived 15 September 2007; published 28 December 2007 A two-dimensional crystalline layer is found at the surface of the liquid eutectic Au82Si18 alloy above its melting point TM=359 °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 °C. The crystalline phase observed for T>371 °C is stable up to at least 430 °C. Grazing-incidence x-ray diffraction data at T>371 °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 °C<T<371 °C. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.245436
DOI:
10.1103/PhysRevB.76.245436
PACS:
68.03.−g, 61.66.Dk, 68.35.Bs, 61.25.Mv
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