Structural origin of fragility in Ge-As-S glasses investigated by calorimetry and Raman spectroscopy

Yan Yang, Bin Zhang, Anping Yang, Zhiyong Yang, Pierre Lucas

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The fragility index (m) of a series of Ge-As-S glasses covering a wide range of mean coordination (<r>) and stoichiometry is measured by differential scanning calorimetry. The evolution of the fragility index appears to be better predicted by the stoichiometry than the mean coordination, and m shows a well-defined dependence on the departure from stoichiometry quantified as the at. % excess or deficiency in sulfur. The effect of stoichiometry on the fragility of Ge-As-S glasses is very similar to that observed in the Ge-As-Se system. A systematic Raman spectroscopy investigation also indicates the presence of large fractions of molecular species such as S<inf>8</inf>, As<inf>4</inf>S<inf>4</inf>, and As<inf>4</inf>S<inf>3</inf> in the structure of some glasses. The presence of molecular species is shown to increase the fragility and decrease the glass transition temperature (T<inf>g</inf>). These results emphasize that short-range order rather than long-range characteristics such as structural rigidity appears to control the fragility of chalcogenide glasses.

Original languageEnglish (US)
Pages (from-to)5096-5101
Number of pages6
JournalJournal of Physical Chemistry B
Volume119
Issue number15
DOIs
StatePublished - Apr 16 2015

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S glass
Calorimetry
Stoichiometry
Raman spectroscopy
stoichiometry
heat measurement
Glass
spectroscopy
glass
structural stability
Sulfur
Rigidity
glass transition temperature
Differential scanning calorimetry
coverings
sulfur
scanning

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Structural origin of fragility in Ge-As-S glasses investigated by calorimetry and Raman spectroscopy. / Yang, Yan; Zhang, Bin; Yang, Anping; Yang, Zhiyong; Lucas, Pierre.

In: Journal of Physical Chemistry B, Vol. 119, No. 15, 16.04.2015, p. 5096-5101.

Research output: Contribution to journalArticle

Yang, Yan ; Zhang, Bin ; Yang, Anping ; Yang, Zhiyong ; Lucas, Pierre. / Structural origin of fragility in Ge-As-S glasses investigated by calorimetry and Raman spectroscopy. In: Journal of Physical Chemistry B. 2015 ; Vol. 119, No. 15. pp. 5096-5101.
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