NiTi2, a new liquid glass
File(s)
Published version
Author(s)
Tournier, Robert F
Ojovan, Michael I
Type
Journal Article
Abstract
Many endothermic liquid-liquid transitions, occurring at a temperature Tn+ above the melting temperature Tm, are related to previous exothermic transitions, occurring at a temperature Tx after glass formation below Tg, with or without attached crystallization and predicted by the nonclassical homogenous nucleation equation. A new thermodynamic phase composed of broken bonds (configurons), driven by percolation thresholds, varying from ~0.145 to Δε, is formed at Tx, with a constant enthalpy up to Tn+. The liquid fraction Δε is a liquid glass up to Tn+. The solid phase contains glass and crystals. Molecular dynamics simulations are used to induce, in NiTi2, a reversible first-order transition by varying the temperature between 300 and 1000 K under a pressure of 1000 GPa. Cooling to 300 K, without applied pressure, shows the liquid glass presence with Δε = 0.22335 as memory effect and Tn+ = 2120 K for Tm = 1257 K.
Date Issued
2023-10-13
Date Acceptance
2023-10-11
Citation
Materials, 2023, 16 (20)
ISSN
1996-1944
Journal / Book Title
Materials
Volume
16
Issue
20
Copyright Statement
© 2023 by the authors.
Licensee MDPI, Basel, Switzerland.
This article is an open access article
distributed under the terms and
conditions of the Creative Commons
Attribution (CC BY) license (https://
creativecommons.org/licenses/by/
4.0/).
Licensee MDPI, Basel, Switzerland.
This article is an open access article
distributed under the terms and
conditions of the Creative Commons
Attribution (CC BY) license (https://
creativecommons.org/licenses/by/
4.0/).
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/37895662
PII: ma16206681
Subjects
configurons
glass
liquid glass
molecular dynamic simulations
phase transitions
Publication Status
Published
Coverage Spatial
Switzerland
Article Number
6681