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Temperature-Dependent Structural Evolution in Au44Ga56 Liquid Eutectic Alloy

Journal Article · · Journal of Physical Chemistry. C
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  1. Zhejiang Univ., Hangzhou (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
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We report that temperature-dependent short-range structural evolution of Au44Ga56 liquid eutectic alloy has been studied by in situ extended X-ray absorption fine structure (EXAFS), in situ high-energy X-ray diffraction (HEXRD) together with first-principles molecular dynamics (FPMD) simulations. It is found that the short-range structure of Au44Ga56 liquid strongly inherits the local atomic packing of the AuGa compound. A short-range structural change in Ga-centered clusters is revealed by in situ EXAFS data at the Ga K-edge at about 970 K, while no such change in Au-centered clusters appears at the Au L-III-edge. The in situ HEXRD and FPMD simulations also confirm the existence of a liquid-to-liquid crossover (LLC) in the Au44Ga56 liquid at a temperature range of about 1000-1100 K, mainly lying in the local structural change around Ga atoms. Indeed, the alloys quenched from the liquid phases below 1000 K and above 1100 K exhibit differences in structure and magnetic properties, which opens a possibility to fabricate new materials with different structures and properties in LLC-containing alloys.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Natural Science Foundation of Zhejiang Province; Fundamental Research Funds for the Central Universities
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1617894
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 41 Vol. 123; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE