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Atomic structure of glassy Mg60Cu30Y10 investigated with EXAFS, x-ray and neutron diffraction, and reverse Monte Carlo simulations
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 5, 054208- p.Article in journal (Refereed) Published
Abstract [en]

Short range order of amorphous Mg60Cu30Y10 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 Mg2Cu. The Cu-Y coordination number is 1.1 +/- 0.2, and the Cu-Y distance is similar to 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: Mg2Cu and most likely cubic MgY and CuMgY.

Place, publisher, year, edition, pages
2007. Vol. 76, no 5, 054208- p.
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Physical Sciences
URN: urn:nbn:se:uu:diva-143849DOI: 10.1103/PhysRevB.76.054208ISI: 000249155100060OAI: oai:DiVA.org:uu-143849DiVA: diva2:391705
Available from: 2011-01-25 Created: 2011-01-25 Last updated: 2011-01-25Bibliographically approved

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The Studsvik Neutron Research Laboratory
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