Calorimetric studies of the energy landscapes of glassformers by hyperquenching methods

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16 Citations (Scopus)

Abstract

We consider some of the conditions associated with ergodicity-breaking and vitrification, in particular the equivalent, in quench vitrification, of the ωτ=1 condition that is well-known in relaxation spectroscopy. For a given quench rate, Q=dT/dt, strong liquids are trapped at much higher temperatures, relative to Tg, than are fragile liquids. We relate the trapping of the system during quenches to the multidimensional 'energy landscape' by means of which the configurational microstates of the system are defined. To characterize the energy landscape at energy levels that are usually associated with fluid materials, we use differential scanning calorimetry on hyperquenched glasses. This yields not only the excess potential energies of the states trapped-in during quench Q, but also the trap depths. The latter are found to be much smaller, relative to kTg, for strong liquids than they are for fragile liquids.

Original languageEnglish (US)
Pages (from-to)785-794
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume69
Issue number3
DOIs
StatePublished - 2002

Fingerprint

vitrification
Vitrification
Liquids
liquids
energy
Potential energy
Electron energy levels
Differential scanning calorimetry
heat measurement
energy levels
potential energy
trapping
traps
Spectroscopy
Glass
scanning
Fluids
glass
fluids
spectroscopy

Keywords

  • Energy landscape
  • Fictive temperature
  • Glass transition
  • Hyperquenching

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

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abstract = "We consider some of the conditions associated with ergodicity-breaking and vitrification, in particular the equivalent, in quench vitrification, of the ωτ=1 condition that is well-known in relaxation spectroscopy. For a given quench rate, Q=dT/dt, strong liquids are trapped at much higher temperatures, relative to Tg, than are fragile liquids. We relate the trapping of the system during quenches to the multidimensional 'energy landscape' by means of which the configurational microstates of the system are defined. To characterize the energy landscape at energy levels that are usually associated with fluid materials, we use differential scanning calorimetry on hyperquenched glasses. This yields not only the excess potential energies of the states trapped-in during quench Q, but also the trap depths. The latter are found to be much smaller, relative to kTg, for strong liquids than they are for fragile liquids.",
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AB - We consider some of the conditions associated with ergodicity-breaking and vitrification, in particular the equivalent, in quench vitrification, of the ωτ=1 condition that is well-known in relaxation spectroscopy. For a given quench rate, Q=dT/dt, strong liquids are trapped at much higher temperatures, relative to Tg, than are fragile liquids. We relate the trapping of the system during quenches to the multidimensional 'energy landscape' by means of which the configurational microstates of the system are defined. To characterize the energy landscape at energy levels that are usually associated with fluid materials, we use differential scanning calorimetry on hyperquenched glasses. This yields not only the excess potential energies of the states trapped-in during quench Q, but also the trap depths. The latter are found to be much smaller, relative to kTg, for strong liquids than they are for fragile liquids.

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