A mechanism for ageing in a deeply supercooled molecular glass

Andrew Cassidy; Mads R.V. Jørgensen; Artur Glavic; Valeria Lauter; Oksana Plekan; David Field

doi:10.1039/d1cc01639c

A mechanism for ageing in a deeply supercooled molecular glass

Andrew Cassidy, Mads R.V. Jørgensen, Artur Glavic, Valeria Lauter, Oksana Plekan, David Field

MAX IV Laboratory

Research output: Contribution to journal › Article › peer-review

Abstract

Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films ofcis-methyl formate, provide the first direct assessment of the energy barrier to secondary relaxation in a molecular glass. At temperatures far below the glass transition temperature, the mechanism of relaxation is shown to be through hindered molecular rotation. Magnetically-polarised neutron scattering experiments exclude diffusion, which is demonstrated to take place only close to the glass transition temperature.

Original language	English
Pages (from-to)	6368-6371
Number of pages	4
Journal	Chemical Communications
Volume	57
Issue number	52
DOIs	https://doi.org/10.1039/d1cc01639c
Publication status	Published - 2021 Jul 4

Subject classification (UKÄ)

Condensed Matter Physics (including Material Physics, Nano Physics)

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10.1039/d1cc01639cLicence: CC BY

Cite this

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AU - Plekan, Oksana

AU - Field, David

PY - 2021/7/4

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AB - Measurements of the decay of electric fields, formed spontaneously within vapour-deposited films ofcis-methyl formate, provide the first direct assessment of the energy barrier to secondary relaxation in a molecular glass. At temperatures far below the glass transition temperature, the mechanism of relaxation is shown to be through hindered molecular rotation. Magnetically-polarised neutron scattering experiments exclude diffusion, which is demonstrated to take place only close to the glass transition temperature.

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A mechanism for ageing in a deeply supercooled molecular glass

Abstract

Subject classification (UKÄ)

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