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Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy
Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimenta...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859095/ https://www.ncbi.nlm.nih.gov/pubmed/29555920 http://dx.doi.org/10.1038/s41467-018-03604-2 |
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author | Zhang, Pei Maldonis, Jason J. Liu, Ze Schroers, Jan Voyles, Paul M. |
author_facet | Zhang, Pei Maldonis, Jason J. Liu, Ze Schroers, Jan Voyles, Paul M. |
author_sort | Zhang, Pei |
collection | PubMed |
description | Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimental visualization of the spatially heterogeneous dynamics as a function of temperature in the supercooled liquid state of a Pt-based metallic glass, using electron correlation microscopy with sub-nanometer resolution. An experimental four-point space-time correlation function demonstrates a growing dynamic correlation length, ξ, upon cooling of the liquid toward the glass transition temperature. ξ as a function of the relaxation time τ are in good agreement with Adam-Gibbs theory, inhomogeneous mode-coupling theory and random first-order transition theory of the glass transition. The same experiments demonstrate the existence of a nanometer thickness near-surface layer with order of magnitude shorter relaxation time than inside the bulk. |
format | Online Article Text |
id | pubmed-5859095 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58590952018-03-21 Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy Zhang, Pei Maldonis, Jason J. Liu, Ze Schroers, Jan Voyles, Paul M. Nat Commun Article Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. Here, we report direct experimental visualization of the spatially heterogeneous dynamics as a function of temperature in the supercooled liquid state of a Pt-based metallic glass, using electron correlation microscopy with sub-nanometer resolution. An experimental four-point space-time correlation function demonstrates a growing dynamic correlation length, ξ, upon cooling of the liquid toward the glass transition temperature. ξ as a function of the relaxation time τ are in good agreement with Adam-Gibbs theory, inhomogeneous mode-coupling theory and random first-order transition theory of the glass transition. The same experiments demonstrate the existence of a nanometer thickness near-surface layer with order of magnitude shorter relaxation time than inside the bulk. Nature Publishing Group UK 2018-03-19 /pmc/articles/PMC5859095/ /pubmed/29555920 http://dx.doi.org/10.1038/s41467-018-03604-2 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Zhang, Pei Maldonis, Jason J. Liu, Ze Schroers, Jan Voyles, Paul M. Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title | Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title_full | Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title_fullStr | Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title_full_unstemmed | Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title_short | Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
title_sort | spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859095/ https://www.ncbi.nlm.nih.gov/pubmed/29555920 http://dx.doi.org/10.1038/s41467-018-03604-2 |
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