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Title: Transition threshold in Ge{sub x}Sb{sub 10}Se{sub 90−x} glasses

Ge{sub x}Sb{sub 10}Se{sub 90−x} glasses with Ge content from 7.5 to 32.5 at. % have been prepared by melt-quench technique, and the physical parameters including glass transition temperature (T{sub g}), density (ρ), compactness (C), shear elastic moduli (C{sub s}), compression elastic moduli (C{sub c}), refractive index (n), and optical bandgap (E{sub g}) have been investigated. While all these physical parameters show threshold behavior in the glass with a chemically stoichiometric composition. Raman spectra analysis also indicates that, with increasing Ge content, Se-chains or rings gradually disappear until all Se-atoms are consumed in the glass with a chemically stoichiometric composition. With further increasing Ge content, homopolar Ge-Ge and Sb-Sb bonds are formed and the chemical order in the glasses is violated. The threshold behavior of the physical properties in the Ge{sub x}Sb{sub 10}Se{sub 90−x} glasses can be traced to demixing of networks above the chemically stoichiometric composition.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Department of Applied Physics, Chongqing University, Chongqing 401331 (China)
  2. (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia)
  3. Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211 (China)
  4. Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia)
Publication Date:
OSTI Identifier:
22271184
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIMONIDES; DENSITY; ELASTICITY; ELECTRONIC STRUCTURE; ENERGY GAP; GERMANIUM SELENIDES; GLASS; RAMAN SPECTRA; REFRACTIVE INDEX; SHEAR; STOICHIOMETRY; TRANSITION TEMPERATURE; YOUNG MODULUS