Two-order-parameter model of the liquid-glass transition. III. Universal patterns of relaxations in glass-forming liquids

@article{citeulike:2795661, abstract = {In the preceding companion papers (paper I and II), we propose a possible origin of the slow dynamics associated with the liquid-glass transition in the light of our two-order-parameter model of liquids. Our model suggests that there exist two levels of dynamic structural heterogeneity, namely, [`]locally favored structures and their clusters' and [`]metastable solid-like islands'. On the basis of this picture, we consider how all the dynamic modes associated with a glass transition, covering from the boson peak to the structural relaxation ([alpha]) mode, can be explained within the same model. We assign the boson peak to (quasi-) localized vibrational modes characteristic of locally favored structures and their clusters and the ultrafast mode to their overdamped states. We assign the fast [beta] mode to the restricted [`]translational' motion, while the slow [beta] mode to the restricted [`]rotational' (librational) motion characteristic of molecules in metastable islands, which exist only below . The [alpha] mode is associated with dynamics of creation and annihilation of metastable islands below . The appearance and disappearance of the modes as a function of the temperature are discussed, focusing on the behavior of locally favored structures and metastable solid-like islands.}, author = {Tanaka, Hajime }, citeulike-article-id = {2795661}, doi = {10.1016/j.jnoncrysol.2005.09.010}, journal = {Journal of Non-Crystalline Solids}, keywords = {2005, glass, model, tanaka, theory}, month = {November}, number = {43-45}, pages = {3396--3413}, posted-at = {2008-05-15 17:17:13}, priority = {2}, title = {Two-order-parameter model of the liquid-glass transition. III. Universal patterns of relaxations in glass-forming liquids}, url = {http://dx.doi.org/10.1016/j.jnoncrysol.2005.09.010}, volume = {351}, year = {2005} }

TY - JOUR ID - citeulike:2795661 L3 - citeulike-article-id:2795661 TI - Two-order-parameter model of the liquid-glass transition. III. Universal patterns of relaxations in glass-forming liquids JF - Journal of Non-Crystalline Solids VL - 351 IS - 43-45 SP - 3396 EP - 3413 N2 - In the preceding companion papers (paper I and II), we propose a possible origin of the slow dynamics associated with the liquid-glass transition in the light of our two-order-parameter model of liquids. Our model suggests that there exist two levels of dynamic structural heterogeneity, namely, [`]locally favored structures and their clusters' and [`]metastable solid-like islands'. On the basis of this picture, we consider how all the dynamic modes associated with a glass transition, covering from the boson peak to the structural relaxation ([alpha]) mode, can be explained within the same model. We assign the boson peak to (quasi-) localized vibrational modes characteristic of locally favored structures and their clusters and the ultrafast mode to their overdamped states. We assign the fast [beta] mode to the restricted [`]translational' motion, while the slow [beta] mode to the restricted [`]rotational' (librational) motion characteristic of molecules in metastable islands, which exist only below . The [alpha] mode is associated with dynamics of creation and annihilation of metastable islands below . The appearance and disappearance of the modes as a function of the temperature are discussed, focusing on the behavior of locally favored structures and metastable solid-like islands. KW - 2005 KW - glass KW - model KW - tanaka KW - theory AU - Tanaka, Hajime PY - 2005/11/01/ UR - http://dx.doi.org/10.1016/j.jnoncrysol.2005.09.010 ER -