Loosing thermodynamic stability in amorphous materials
The primary relaxation dynamics near the glass transformation temperature T g exhibits universal features in all glass formers, when showing two-level tunneling states (Low Temp. Phys. 35, 282 (2009)). Researchers have long searched for any signature of the underlying “true” ergodic–nonergodic trans...
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| Дата: | 2011 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2011
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/118550 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Loosing thermodynamic stability in amorphous materials / V.B. Kokshenev // Физика низких температур. — 2011. — Т. 37, № 5. — С. 551–557. — Бібліогр.: 26 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1185502017-05-31T03:03:10Z Loosing thermodynamic stability in amorphous materials Kokshenev, V.B. 8th International Conference on Cryocrystals and Quantum Crystals The primary relaxation dynamics near the glass transformation temperature T g exhibits universal features in all glass formers, when showing two-level tunneling states (Low Temp. Phys. 35, 282 (2009)). Researchers have long searched for any signature of the underlying “true” ergodic–nonergodic transition emerging at a certain thermodynamic instability temperature Te . Here, the relaxation timescale for glass-forming materials is analyzed within a self-consistent thermodynamic cluster description combined with the cluster percolation concept. Exploring the ergodic hypothesis, its violation is found near a crossover from the Gaussian to non-Gaussian (Poisson) cluster-volume fluctuations, describing the finite-size fractal-cluster distributions. The transformation of the compact-structure “ergodic” clusters into hole-like glassy nanoclusters is attributed to the critical-size thermal fluctuations. The ergodic–nonergodic phase diagram showing Te is predicted in the model-independent form through the glass fragility parameter known for organic and inorganic liquids and amorphous solids. In all cases the ergodic-instability temperature is located below and close to the glass transformation temperature, whereas the distance between the two characteristic temperatures decreases with growing the material fragility. 2011 Article Loosing thermodynamic stability in amorphous materials / V.B. Kokshenev // Физика низких температур. — 2011. — Т. 37, № 5. — С. 551–557. — Бібліогр.: 26 назв. — англ. 0132-6414 PACS: 61.41.+e, 61.43.Fs, 64.70.P– http://dspace.nbuv.gov.ua/handle/123456789/118550 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
8th International Conference on Cryocrystals and Quantum Crystals 8th International Conference on Cryocrystals and Quantum Crystals |
| spellingShingle |
8th International Conference on Cryocrystals and Quantum Crystals 8th International Conference on Cryocrystals and Quantum Crystals Kokshenev, V.B. Loosing thermodynamic stability in amorphous materials Физика низких температур |
| description |
The primary relaxation dynamics near the glass transformation temperature T g exhibits universal features in all glass formers, when showing two-level tunneling states (Low Temp. Phys. 35, 282 (2009)). Researchers have long searched for any signature of the underlying “true” ergodic–nonergodic transition emerging at a certain thermodynamic instability temperature Te . Here, the relaxation timescale for glass-forming materials is analyzed within a self-consistent thermodynamic cluster description combined with the cluster percolation concept. Exploring the ergodic hypothesis, its violation is found near a crossover from the Gaussian to non-Gaussian (Poisson) cluster-volume fluctuations, describing the finite-size fractal-cluster distributions. The transformation of the compact-structure “ergodic” clusters into hole-like glassy nanoclusters is attributed to the critical-size thermal fluctuations. The ergodic–nonergodic phase diagram showing Te is predicted in the model-independent form through the glass fragility parameter known for organic and inorganic liquids and amorphous solids. In all cases the ergodic-instability temperature is located below and close to the glass transformation temperature, whereas the distance between the two characteristic temperatures decreases with growing the material fragility. |
| format |
Article |
| author |
Kokshenev, V.B. |
| author_facet |
Kokshenev, V.B. |
| author_sort |
Kokshenev, V.B. |
| title |
Loosing thermodynamic stability in amorphous materials |
| title_short |
Loosing thermodynamic stability in amorphous materials |
| title_full |
Loosing thermodynamic stability in amorphous materials |
| title_fullStr |
Loosing thermodynamic stability in amorphous materials |
| title_full_unstemmed |
Loosing thermodynamic stability in amorphous materials |
| title_sort |
loosing thermodynamic stability in amorphous materials |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2011 |
| topic_facet |
8th International Conference on Cryocrystals and Quantum Crystals |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/118550 |
| citation_txt |
Loosing thermodynamic stability in amorphous materials / V.B. Kokshenev // Физика низких температур. — 2011. — Т. 37, № 5. — С. 551–557. — Бібліогр.: 26 назв. — англ. |
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Физика низких температур |
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