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Understanding the emergence of the boson peak in molecular glassesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: González-Jiménez Mario, Barnard Trent, Russell Ben A., Tukachev Nikita V., Javornik Uroš, Hayes Laure-Anne, Farrell Andrew J., Guinane Sarah, Senn Hans M., Smith Andrew J., Wilding Martin, Mali Gregor, Nakano Motohiro, Miyazaki Yuji, McMillan Paul, Sosso Gabriele C., Wynne Klaas
- Журнал: Nature communications
- Том: 14
- Номер: 1
- Год издания: 2023
- Издательство: Nature Pub. Group
- Местоположение издательства: United Kingdom
- DOI: 10.1038/s41467-023-35878-6
- Аннотация: A common feature of glasses is the “boson peak”, observed as an excess in the heat capacity over the crystal or as an additional peak in the terahertz vibrational spectrum. The microscopic origins of this peak are not well understood; the emergence of locally ordered structures has been put forward as a possible candidate. Here, we show that depolarised Raman scattering in liquids consisting of highly symmetric molecules can be used to isolate the boson peak, allowing its detailed observation from the liquid into the glass. The boson peak in the vibrational spectrum matches the excess heat capacity. As the boson peak intensifies on cooling, wide-angle x-ray scattering shows the simultaneous appearance of a pre-peak due to molecular clusters consisting of circa 20 molecules. Atomistic molecular dynamics simulations indicate that these are caused by over-coordinated molecules. These findings represent an essential step toward our understanding of the physics of vitrification.
- Добавил в систему: Тукачев Никита Витальевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | 41467_2023_35878_MOESM1_ESM.pdf | 41467_2023_35878_MOESM1_ESM.pdf | 7,5 МБ | 30 июня 2023 [Isengrim] | |
| 2. | s41467-023-35878-6.pdf | s41467-023-35878-6.pdf | 1,4 МБ | 30 июня 2023 [Isengrim] |