Evidence of network demixing in GeS{sub 2}-Ga{sub 2}S{sub 3} chalcogenide glasses: A phase transformation study

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.01.018· OSTI ID:21494231

Lin, Changgui ^[1]; Calvez, Laurent ^[2]; Tao, Haizheng ^[1]; Allix, Mathieu ^[3]; Moreac, Alain ^[4]; Zhang, Xianghua ^[2]; Zhao, Xiujian ^[1]

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1. Key Laboratory of Silicate Materials Science and Engineering (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei 430070 (China)
2. Laboratoire des Verres et Ceramiques, UMR-CNRS 6226, Sciences chimiques de Rennes, Universite de Rennes 1, 35042 Rennes Cedex (France)
3. CNRS, UPR3079 CEMHTI, 45071 Orleans Cedex 2 (France)
4. GMCM, UMR-CNRS 6626, Universite de Rennes 1, 35042 Rennes Cedex (France)

The information of phase transformation is attained by in situ XRD experiments leading to the knowledge of topological threshold in GeS{sub 2}-Ga{sub 2}S{sub 3} glasses. The turning point of phase transformation behavior is demonstrated to be glasses containing 14-15 mol% Ga{sub 2}S{sub 3}. To interpret it a network demixing model is further improved and proposed for the structure of these ternary or quasi-binary chalcogenide glasses. For the nearest-neighbor coordination environment of glass with a transitional composition of 85.7 mol% (6/7) GeS{sub 2}.14.3 mol% (1/7) Ga{sub 2}S{sub 3}, six-coordinated [S{sub 3}Ga-X-GaS{sub 3}] units (X=S or None) are well isolated by the [GeS{sub 4}] structures, which contributes to the decreasing of precipitation of Ga{sub 2}S{sub 3} crystals in (100-x)GeS{sub 2}-xGa{sub 2}S{sub 3} (x{<=}14.3) glasses corresponding to the experimental evidence of the phase transformation behavior. This scenario of intermediate-range structural order, firstly, includes the arrangement of structural units which is consistent with and provides an atomistic explanation of the compositional evolution of phase transformation behavior in these glasses. -- Graphical abstract: Synopsis: network demixing in GeS{sub 2}-Ga{sub 2}S{sub 3} chalcogenide glasses. Display Omitted Highlights: {yields} Phase transformation in GeS{sub 2}-Ga{sub 2}S{sub 3} glasses. {yields} Turning point of the phase transformation behavior. {yields} Medium-range order structure of chalcogenide glasses. {yields} Network demixing model for GeS{sub 2}-Ga{sub 2}S{sub 3} glasses.

• OSTI ID: 21494231
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 3; Other Information: DOI: 10.1016/j.jssc.2011.01.018; PII: S0022-4596(11)00019-3; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CRYSTALS
GALLIUM SULFIDES
GERMANIUM SULFIDES
GLASS
PHASE TRANSFORMATIONS
PRECIPITATION
TOPOLOGY
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
GALLIUM COMPOUNDS
GERMANIUM COMPOUNDS
MATHEMATICS
SCATTERING
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS