One- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Calcium nitrate-potassium nitrate system

Senapati, H.; Kadiyala, R. K.; Angell, Charles

doi:10.1021/j100171a060

Cited by 32 publications

(26 citation statements)

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“…Consequently, the LJG system has a much longer crystallization time than the LJ system, and we can clearly see the temperature dependence of the TTT diagram in the LJG system. It shows a typical nose shape, which has been observed by experiments for various glass forming materials [3,20,21]. A similar TTT diagram is also found by MD simulations with some empirical potentials for metal [22,23].…”

Section: Resultssupporting

confidence: 83%

Vitrification of a monatomic 2D simple liquid

Mizuguchi

Odagaki

2009

Open Physics

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Abstract:A monatomic simple liquid in two dimensions, where atoms interact isotropically through the LennardJones-Gauss potential [M. Engel, H.-R. Trebin, Phys. Rev. Lett. 98, 225505 (2007)], is vitrified by the use of a rapid cooling technique in a molecular dynamics simulation. Transformation to a crystalline state is investigated at various temperatures and the time-temperature-transformation (TTT) curve is determined. It is found that the transformation time to a crystalline state is the shortest at a temerature 14% below the melting temperature T and that at temperatures below T ≡ 0 6T the transformation time is much longer than the available CPU time. This indicates that a long-lived glassy state is realized for T ≤ T .

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Section: Resultssupporting

confidence: 83%

Vitrification of a monatomic 2D simple liquid

Mizuguchi

Odagaki

2009

Open Physics

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“…Thus, a material cooled at R crit and identified as “glassy” may in fact contain scores of nuclei 60, 61. This type of process in which nuclei are “quenched‐in” has been commonly observed in the formation of metallic glasses62–65 as well as in organic materials 66, 67.…”

Section: Discussionmentioning

confidence: 97%

“…This difference in behavior can be readily explained by reference to Figure 6. As shown in Figure 6, the critical cooling rate at which no crystallization is observed is slower than the critical cooling rate necessary to prevent the to prevent the formation of nuclei,60 due to nucleation being an intrinsically faster process on a shorter length scale compared to crystal growth. Consequently, if the cooling rate is slower than R Ncrit (see Fig.…”

Section: Discussionmentioning

confidence: 99%

A Classification System to Assess the Crystallization Tendency of Organic Molecules from Undercooled Melts

Baird

Eerdenbrugh

Taylor

2010

Journal of Pharmaceutical Sciences

571

671

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“…Because the TTT curve determined in most studies is that representing the combination of nucleation and growth, it is easy to forget that a sample that is fully glassy because it has been cooled faster than the critical cooling rate might in fact be choked with nuclei, because the cooling that has bypassed the nose of the TTT curve has cut right across the faster process which is the pure nucleation process, as shown in Figure 2. 16 The glass so made will be prone to rapid crystallization during reheating, because all that is needed is the growth of nuclei already present. This is the principal reason for the common observation that a glass that seemed to easily bypass crystallization during cooling crystallizes readily during reheating.…”

Section: Crystallization Via Nucleation and Growthmentioning

confidence: 99%

Glass-Formers and Viscous Liquid Slowdown since David Turnbull: Enduring Puzzles and New Twists

Angell

2008

MRS Bull.

117

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To Turnbull's study of the kinetic problem of nucleation and growth of crystals, we add the further enquiry into what lies behind the slow nucleation kinetics of glass-formers. Our answer to this question leads to the proposal of conditions in which a pure liquid metal, monatomic and elemental, can be vitrified. Using the case of high-pressure liquid germanium, we give electron microscope evidence for the validity of our thinking.On the question of how liquids behave when crystals do not form, Turnbull pioneered the study of glass transitions in metallic alloys, measuring the heat capacity change at the glass transition Tg for the first time, and developing with Cohen the free volume model for the temperature dependence of liquid transport properties approaching Tg. We extend the phenomenological picture to include networks where free volume does not play a role and reveal a pattern of behavior that provides for a classification of glass-formers (from “strong” to “fragile”). Where Turnbull studied supercooled liquid metals and P4 to the homogeneous nucleation limit using small droplets, we studied supercooled water in capillaries and emulsions to the homogeneous nucleation limit near −40°C. We discuss the puzzling divergences observed that are now seen as part of a cooperative transition that leads to very untypical glass-transition behavior at lower temperatures (when crystallization is bypassed by hyperquenching). Finally, we show how our interpretation of water behavior can be seen as a bridge between the behavior of the “strong” (network) liquids of classical glass science (e.g., SiO2) and the “fragile” behavior of typical molecular glass-formers. The link is made using a “Gaussian excitations” model by Matyushov and the author in which the spike in heat capacity for water is pushed by cooperativity (disorder stabilization of excitations) into a first-order transition to the ground state, at a temperature typically below Tg. In exceptional cases like triphenyl phosphite, this liquid-to-glass first-order transition lies above Tg and can be studied in detail.

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One- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Calcium nitrate-potassium nitrate system

Cited by 32 publications

References 1 publication

Vitrification of a monatomic 2D simple liquid

Vitrification of a monatomic 2D simple liquid

A Classification System to Assess the Crystallization Tendency of Organic Molecules from Undercooled Melts

Glass-Formers and Viscous Liquid Slowdown since David Turnbull: Enduring Puzzles and New Twists

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