Fragile-strong behavior in the As xSe 1-x glass forming system in relation to structural dimensionality

Guang Yang, Ozgur Gulbiten, Yann Gueguen, Bruno Bureau, Jean Christophe Sangleboeuf, Claire Roiland, Ellyn A. King, Pierre Lucas

Research output: Contribution to journalArticle

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Abstract

A series of physical properties have been measured throughout and above the glass transition for the whole As xSe 1-x system, including the activation for viscous flow E η, the activation energy for enthalpy relaxation E H, and the activation energy for structural relaxation E a obtained by specific heat spectroscopy. All properties show a double minimum at an average coordination number 〈r〉 = 2.3 and 〈r〉 = 2.5 with a local maximum at 〈r〉 = 2.4. This is in stark contrast to the physical properties previously measured on the same samples at room temperature and which instead show a single minimum centered at 〈r〉 = 2.4. The observed trend is consistent with the dimensionality of the network derived from structural data obtained by nuclear magnetic resonance. An analysis of the complex heat capacity also reveals a bimodal relaxation process in As-rich glasses, which explains why they are kinetically fragile but appear thermodynamically strong. Finally, these results demonstrate that previous observations of an "intermediate phase" in As xSe 1-x glasses near 〈r〉 = 2.3 is associated with the high temperature behavior of the glassy network and should be interpreted in terms of the temperature dependence of structural constraints rather than the number of constraints in the room-temperature glass.

Original languageEnglish (US)
Article number144107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number14
DOIs
StatePublished - Apr 10 2012

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Glass
glass
Specific heat
Activation energy
Physical properties
physical properties
specific heat
activation energy
Temperature
Structural relaxation
Relaxation processes
room temperature
viscous flow
Viscous flow
coordination number
Glass transition
Enthalpy
enthalpy
Chemical activation
Nuclear magnetic resonance

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Fragile-strong behavior in the As xSe 1-x glass forming system in relation to structural dimensionality. / Yang, Guang; Gulbiten, Ozgur; Gueguen, Yann; Bureau, Bruno; Sangleboeuf, Jean Christophe; Roiland, Claire; King, Ellyn A.; Lucas, Pierre.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 14, 144107, 10.04.2012.

Research output: Contribution to journalArticle

Yang, Guang ; Gulbiten, Ozgur ; Gueguen, Yann ; Bureau, Bruno ; Sangleboeuf, Jean Christophe ; Roiland, Claire ; King, Ellyn A. ; Lucas, Pierre. / Fragile-strong behavior in the As xSe 1-x glass forming system in relation to structural dimensionality. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 14.
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