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• W2019946015 abstract "In bulk glass forming Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4) the mean Ni, Ti, and Cu self-diffusion coefficient at the liquidus is about 10 − 10 m2 s − 1. Compared with these values, diffusion coefficients derived from various reported viscosity data by rescaling them via the Stokes–Einstein relation exhibit different temperature dependence and absolute values are a factor of 5–10 smaller. This raises the question of whether a slow Zr subsystem exists in the melt at temperatures well above the liquidus temperature. Here, we address this question by studying microscopic dynamics employing quasielastic neutron scattering. We utilized containerless sample processing in a novel electrostatic levitation apparatus. This excludes reactions between samples and crucible materials and gives access to a wide momentum transfer range of about 0.2–2.6 A − 1. We studied the dynamics governed by the Ni, Ti, and Cu diffusive motion as well as by collective Zr motion. At 1255 K, both correlation functions decay to zero on a timescale of about 20 ps. This shows that there is neither a decoupling between the atomic dynamics of the various components nor a slow Zr subsystem in the equilibrium melt." @default.
• W2019946015 created "2016-06-24" @default.
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• W2019946015 date "2011-06-08" @default.
• W2019946015 modified "2023-10-16" @default.
• W2019946015 title "Structural relaxation as seen by quasielastic neutron scattering on viscous Zr–Ti–Cu–Ni–Be droplets" @default.
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• W2019946015 doi "https://doi.org/10.1088/0953-8984/23/25/254207" @default.
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