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Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature
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Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature
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Journal Article
Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature
2015
Overview
Liquid–liquid transition, a phase transition of one liquid phase to another with the same composition, provides a key opportunity for investigating the relationship between liquid structures and dynamics. Here we report experimental evidences of a liquid–liquid transition in glass-forming La
50
Al
35
Ni
15
melt above its liquidus temperature by
27
Al nuclear magnetic resonance including the temperature dependence of cage volume fluctuations and atomic diffusion. The observed dependence of the incubation time on the degree of undercooling is consistent with a first-order phase transition. Simulation results indicate that such transition is accompanied by the change of bond-orientational order without noticeable change in density. The temperature dependence of atomic diffusion revealed by simulations is also in agreement with experiments. These observations indicate the need of two-order parameters in describing phase transitions of liquids.
Non-density driven liquid-liquid transition has been predicted in theories, but direct experimental verification is challenging because liquid often remains metastable at transition temperature. Here, Xu
et al.
provide evidence in a lanthanum-based metallic glass above its liquidus temperature.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
Subject
