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Structure and thermal properties of Ge-In-S chalcogenide glasses

M. REPKOVÁ1,2,* , P. NĚMEC2, M. FRUMAR2

Affiliation

  1. Institute of Chemistry and Technology of Environmental Protection, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 61200 Brno, Czech Republic
  2. Department of General and Inorganic Chemistry and Research Center, University of Pardubice, Legions Sq. 565, 53210 Pardubice, Czech Republic

Abstract

Glasses whose compositions can be expressed by (GeS2)100-x(In2S3)x (x=0,10,20,30) formula were obtained by the melt quenching technique. The glasses were homogeneous with high optical transmission from visible (0.65 µm) to mid infrared region (10µm). The glass structure was studied by Raman and IR spectroscopy. Main structural units of studied glasses are GeS4 tetrahedra connected to each other by corners and edges, InS4 tetrahedra and InS6 octahedra interconnected by sulfur bridges. The thermal stability was evaluated using differential thermal analysis (DTA) combined with differential scanning calorimetry (DSC) for the determination of characteristic temperatures: Tg ~ temperature of glass transition, Tx ~ temperature of onset of crystallization, Tc ~ temperature of crystallization, Tm ~ temperature of melting. The glass-forming ability was estimated using criteria of thermal stability, so-called the glass-forming criteria (∆T=Tc-Tg; Hruby’s criterion , Hr=( Tc-Tg)/( Tm-Tc); Saad and Poulain’s criterion, S=( Tc-Tx)/( Tx-Tg)/Tg))..

Keywords

Amorphous chalcogenides, Thermal analysis, Raman spectroscopy.

Submitted at: July 10, 2006
Accepted at: Sept. 13, 2006

Citation

M. REPKOVÁ, P. NĚMEC, M. FRUMAR, Structure and thermal properties of Ge-In-S chalcogenide glasses, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1796-1800 (2006)