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- W2094960180 abstract "First-principles molecular dynamics simulations are performed to investigate the atomic size and chemical effects on the short-range order (SRO) in superheated and undercooled Zr-based metallic liquids, ${text{Zr}}_{2}M$ ($M=text{Co}$, Ni, Cu, and Ag). We demonstrate that the local atomic structures in liquids are quite sensitive to the atomic size ratio and the electronic interactions between component elements. The large negative heats of mixing for $text{Zr-}M$ do not favor icosahedral SRO in these binary liquids, contrary to the common belief. Full icosahedral structure units are few in the superheated liquids, although the number of icosahedral clusters increases upon undercooling. Comparing ${text{Zr}}_{2}text{Co}$, ${text{Zr}}_{2}text{Ni}$, and ${text{Zr}}_{2}text{Cu}$, all of which have very similar atomic size ratios, we find that the degree of local icosahedral order increases with decreasing interaction strength between the $d$ electrons in Zr-Co, Zr-Ni, and Zr-Cu. A comparison of ${text{Zr}}_{2}text{Cu}$ and ${text{Zr}}_{2}text{Ag}$ alloys shows that the degree of icosahedral order increases much more in ${text{Zr}}_{2}text{Ag}$ than in ${text{Zr}}_{2}text{Cu}$ with decreasing temperature. The difference in atomic sizes of Cu and Ag may account for the subtle discrepancy in the evolution of short-range ordering in undercooled ${text{Zr}}_{2}text{Cu}$ and ${text{Zr}}_{2}text{Ag}$ liquids." @default.
- W2094960180 created "2016-06-24" @default.
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- W2094960180 date "2010-01-19" @default.
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- W2094960180 title "Atomic size and chemical effects on the local order of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Zr</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi>M</mml:mi></mml:mrow></mml:math>(<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mtext>Co</mml:mtext></mml:mrow></mml:math>, Ni, Cu, and Ag) binary liquids" @default.
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- W2094960180 doi "https://doi.org/10.1103/physrevb.81.014108" @default.
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