Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature

Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature

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 3...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications Vol. 6; no. 1; p. 7696
Main Authors: Xu, Wei, Sandor, Magdalena T., Yu, Yao, Ke, Hai-Bo, Zhang, Hua-Ping, Li, Mao-Zhi, Wang, Wei-Hua, Liu, Lin, Wu, Yue
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 13-07-2015
Nature Publishing Group
Nature Pub. Group
Subjects:
140/131
639/301/119/2795
639/301/923/218
Diffusion
Dynamic structural analysis
Glass formation
Humanities and Social Sciences
Liquid phases
Liquidus
multidisciplinary
NMR
Nuclear magnetic resonance
Order parameters
Phase transitions
Science
Science (multidisciplinary)
Supercooling
Temperature
Temperature dependence
Temperature effects
Time dependence
Variation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms8696