Correlation of viscosity with atomic packing in Cu50Zr50 melt

LY Chen and M Mohr and RK Wunderlich and HJ Fecht and XD Wang and QP Cao and DX Zhang and Y Yang and JZ Jiang, JOURNAL OF MOLECULAR LIQUIDS, 293, 111544 (2019).

DOI: 10.1016/j.molliq.2019.111544

The viscosities of Cu50Zr50 melt from 1250 K to 1435 K were measured in a containerless electromagnetic levitator under microgravity. The viscosity in the investigated temperature range can be expressed by an Arrhenius temperature dependencerg eta(T) = eta(0) exP(E-A/k(B)T),with eta(0) = (0.08 +/- 0.02) mPa.s and E-A = (0.58 +/- 0.03) eV. We find a correlation between the fraction of closer neighboring atoms, f, and viscosity, which is described by eta = exp(n) f(m), where n = 1.746/Delta pe(c)-4.478, m = -0.374/Delta pe(c) + 0.440, and Delta pe(c) is the excess potential energy, indicating that the temperature dependent viscosity during cooling is controlled by the fraction of closer neighboring atoms. (C) 2019 Elsevier B.V. All rights reserved.

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