Atomic Dynamics of Metallic Glass Melts La50Ni15Al35 and Ce70Cu19Al11 Studied by Quasielastic Neutron Scattering

Published

June 23, 2021

Author(s)

Peng Luo, Abhishek Jaiswal, Yanqin Zhai, Zhikun Cai, Nathan P. Walter, Long Zhou, Dawei Ding, Ming Liu, Rebecca Mills, Andrey Podlesnyak, Georg Ehlers, Antonio Faraone, Haiyang Bai, Weihua Wang, Y. Z.

Abstract

By employing quasi-elastic neutron scattering, we studied the atomic-scale relaxation dynamics and transport mechanism of La₅₀Ni₁₅Al₃₅ and Ce₆₉Cu₂₀Al₁₀Nb₁ Studied by Quasi-Elastic Neutron Scattering metallic glass melts in the temperature range of over 200 K above their liquidus temperatures. The results show that both liquids exhibit stretched exponential relaxation and Arrhenius-type temperature dependence of the effective diffusion coefficient. The La₅₀Ni₁₅Al₃₅ melt exhibits an activation energy of 0.545±0.008 eV and a stretching exponent ≈0.77−0.86 in the studied temperature range; no change of activation energy as suggested in previous report associated with liquid–liquid phase transition was observed. In contrast, the Ce₆₉Cu₂₀Al₁₀Nb₁ Studied by Quasi-Elastic Neutron Scattering melt exbibits larger diffusivity with a much smaller activation energy of 0.201±0.003 eV, and a smaller stretching exponent ≈0.51−0.60 suggestive of more heterogeneous dynamics.

Citation

Physical Review B

Volume

103

Issue

22

Pub Type

Journals

Citation

Luo, P. , Jaiswal, A. , Zhai, Y. , Cai, Z. , Walter, N. , Zhou, L. , Ding, D. , Liu, M. , Mills, R. , Podlesnyak, A. , Ehlers, G. , Faraone, A. , Bai, H. , Wang, W. and Z., Y. (2021), Atomic Dynamics of Metallic Glass Melts La₅₀Ni₁₅Al₃₅ and Ce₇₀Cu₁₉Al₁₁ Studied by Quasielastic Neutron Scattering, Physical Review B (Accessed October 5, 2024)