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Related Experiment Video

Updated: Aug 3, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Two-step devitrification of ultrastable glasses.

Cecilia Herrero¹, Camille Scalliet², M D Ediger³

¹Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier 34095, France.

Proceedings of the National Academy of Sciences of the United States of America

|April 11, 2023

Summary

This summary is machine-generated.

Ultrastable glasses transform into liquids in two steps: initial pressurized liquid droplet formation and subsequent accelerated domain growth. This discovery challenges classical devitrification models for glassy systems.

Keywords:

computational methods devitrification glass supercooled liquid

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Chemical Engineering

Background:

Ultrastable glasses present unique challenges in understanding their behavior.
Previous experiments on ultrastable glass devitrification lacked microscopic insights.
Heating ultrastable glasses leads to macroscopic transformation into liquids.

Purpose of the Study:

To analyze the kinetics of ultrastable glass devitrification using molecular dynamics simulations.
To elucidate the microscopic mechanisms governing the transformation of glasses into liquids.
To explain deviations from classical kinetics observed in ultrastable systems.

Main Methods:

Molecular dynamics simulations were employed to study the transformation process.
Analysis focused on the kinetics and mechanisms of devitrification at a microscopic level.
Simulations tracked the nucleation, growth, and coalescence of liquid domains within the glass.

Main Results:

Devitrification in highly stable glasses occurs over extended timescales.
The liquid phase emerges in a two-step process: initial pressurized droplet formation and subsequent domain coalescence.
Coalescence of liquid domains accelerates the overall devitrification rate.
A giant lengthscale characterizes the devitrification of bulk ultrastable glasses.

Conclusions:

The two-step devitrification process deviates significantly from classical Avrami kinetics.
This study clarifies the nonequilibrium kinetics of glasses after a large temperature jump.
Findings provide guidance for future experimental investigations into ultrastable glass behavior.