Kokshenev V. B.
Loosing thermodynamic stability in amorphous materials / V. B. Kokshenev // Физика низких температур. - 2011. - Т. 37, № 5. - С. 551-557. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2011_37_5_21
The primary relaxation dynamics near the glass transformation temperature Tg 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.
Цитованість авторів публікації:Kokshenev V.
Бібліографічний опис для цитування: Kokshenev V. B. Loosing thermodynamic stability in amorphous materials / V. B. Kokshenev // Физика низких температур. - 2011. - Т. 37, № 5. - С. 551-557. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2011_37_5_21.
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