dorsal/arxiv
View SchemaAging vs crystallisation dynamics in hyperquenched glasses and a resolution of the water Tg controversy
| Authors | Y. -Z. Yue, C. A. Angell |
|---|---|
| Categories | |
| ArXiv ID | physics/0207048 |
| URL | https://arxiv.org/abs/physics/0207048 |
Abstract
The possibility of observing a glass transition in water before crystallisation occurs has been debated vigorously but inconclusively over five decades [1,2]. For two decades a glass transition at 136K [2,3] was accepted but this transition has perplexing qualities [4]. Recently it has been argued[2,5],that this assignment must be wrong. The re-assignment of Tg to temperatures above the 150K crystallisation was vigorously contested [6]. Here we use detailed anneal-and-scan studies of a hyperquenched inorganic glass, which does not crystallize on heating, to interpret the perplexing aspects of the 136K water phenomenon. We show that it is indeed linked to a glass transition, though only via a cross-over phenomenon. The thermal history that gives the same behaviour ("shadow" glass transition) in the inorganic glass is linked by crossover to a "normal" glass transition 23% higher in temperature. Thus a Tg is indeed unobservable for water, while the vitreous nature of hyperquenched glassy water is strongly supported. The shadow Tg is reproducible in the inorganic glass as it is in H2O. The observed aging dynamics are very relevant to current glass theory, particularly to dynamical heterogeneity which is seen to have an energy manifestation.
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"abstract": "The possibility of observing a glass transition in water before\ncrystallisation occurs has been debated vigorously but inconclusively over five\ndecades [1,2]. For two decades a glass transition at 136K [2,3] was accepted\nbut this transition has perplexing qualities [4]. Recently it has been\nargued[2,5],that this assignment must be wrong. The re-assignment of Tg to\ntemperatures above the 150K crystallisation was vigorously contested [6]. Here\nwe use detailed anneal-and-scan studies of a hyperquenched inorganic glass,\nwhich does not crystallize on heating, to interpret the perplexing aspects of\nthe 136K water phenomenon. We show that it is indeed linked to a glass\ntransition, though only via a cross-over phenomenon. The thermal history that\ngives the same behaviour (\"shadow\" glass transition) in the inorganic glass is\nlinked by crossover to a \"normal\" glass transition 23% higher in temperature.\nThus a Tg is indeed unobservable for water, while the vitreous nature of\nhyperquenched glassy water is strongly supported. The shadow Tg is reproducible\nin the inorganic glass as it is in H2O. The observed aging dynamics are very\nrelevant to current glass theory, particularly to dynamical heterogeneity which\nis seen to have an energy manifestation.",
"arxiv_id": "physics/0207048",
"authors": [
"Y. -Z. Yue",
"C. A. Angell"
],
"categories": [
"physics.chem-ph"
],
"title": "Aging vs crystallisation dynamics in hyperquenched glasses and a resolution of the water Tg controversy",
"url": "https://arxiv.org/abs/physics/0207048"
},
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