Atomic structure of glassy Mg60 Cu30 Y10 investigated with EXAFS, x-ray and neutron diffraction, and reverse Monte Carlo simulations

Pál Jóvári, Karel Saksl, Nini Pryds, Bente Lebech, Nicholas P. Bailey, Anders Mellergård, Robert G. Delaplane, Hermann Franz

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30 Citations (Scopus)

Abstract

Short range order of amorphous Mg60 Cu30 Y10 was investigated by x-ray and neutron diffraction, Cu and Y K -edge x-ray absorption fine structure measurements, and the reverse Monte Carlo simulation technique. We found that Mg-Mg and Mg-Cu nearest neighbor distances are very similar to values found in crystalline Mg2 Cu. The Cu-Y coordination number is 1.1±0.2, and the Cu-Y distance is ∼4% shorter than the sum of atomic radii, suggesting that attraction between Cu and Y plays an important role in stabilizing the glassy state. Thermal stability and structure evolution upon annealing were also studied by differential scanning calorimetry and in situ x-ray powder diffraction. The alloy shows a glass transition and three crystallization events, the first and dominant one at 456 K corresponding to eutectic crystallization of at least three phases: Mg2 Cu and most likely cubic MgY and CuMgY.

Original languageEnglish
Article number054208
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number5
DOIs
Publication statusPublished - Aug 22 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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