Thermal and gamma-ray induced relaxation in As-S glasses: Modelling and experiment

Pierre Lucas, Ellyn A. King, Robert G. Erdmann, Brian J. Riley, S. K. Sundaram, John S. McCloy

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Enthalpy relaxation was measured in a series of As-S glasses irradiated with gamma rays and these samples are compared with a set of identical control samples kept in the dark. It is shown that gamma irradiation lifts the kinetic barrier for relaxation at room temperature and speeds up the enthalpy release. The measured values of thermal relaxation in the dark agree closely with modelling results obtained by fitting differential scanning calorimetry curves with the Tool-Narayanaswamy-Moynihan (TNM) equations. The measured values of activation energy for enthalpy relaxation are also in close agreement with that predicted by the TNM model, therefore lending credence to the fitting results. These measurements permit extraction of the effect of gamma irradiation on the glass structure for a series of As-S glasses with increasing structural coordination, and gamma irradiation is shown to reduce the structural relaxation time. It is also shown that lower coordination glasses exhibit greater radiation sensitivity but also greater thermal relaxation due to their lower Tg. On the other end, over-coordinated glasses show lower relaxation and almost no radiation sensitivity. This behaviour is similar to the glass response under sub-bandgap light irradiation.

Original languageEnglish (US)
Article number395402
JournalJournal of Physics D: Applied Physics
Volume44
Issue number39
DOIs
StatePublished - Oct 5 2011

Fingerprint

S glass
Gamma rays
gamma rays
Glass
Irradiation
Enthalpy
irradiation
glass
enthalpy
Experiments
Radiation
Structural relaxation
radiation
Relaxation time
Hot Temperature
Differential scanning calorimetry
Energy gap
heat measurement
Activation energy
relaxation time

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Thermal and gamma-ray induced relaxation in As-S glasses : Modelling and experiment. / Lucas, Pierre; King, Ellyn A.; Erdmann, Robert G.; Riley, Brian J.; Sundaram, S. K.; McCloy, John S.

In: Journal of Physics D: Applied Physics, Vol. 44, No. 39, 395402, 05.10.2011.

Research output: Contribution to journalArticle

Lucas, Pierre ; King, Ellyn A. ; Erdmann, Robert G. ; Riley, Brian J. ; Sundaram, S. K. ; McCloy, John S. / Thermal and gamma-ray induced relaxation in As-S glasses : Modelling and experiment. In: Journal of Physics D: Applied Physics. 2011 ; Vol. 44, No. 39.
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