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    Relative Influence of Topology, Dimensionality and Stoichiometry Toward the Properties of Covalent Network Glasses

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    Author
    Lucas, Pierre
    Affiliation
    Univ Arizona, Dept Mat Sci & Engn
    Issue Date
    2019-07-23
    Keywords
    chalcogenide glass
    density
    fragility
    stoichiometry
    topology
    dimensionality
    
    Metadata
    Show full item record
    Publisher
    FRONTIERS MEDIA SA
    Citation
    Lucas P (2019) Relative Influence of Topology, Dimensionality and Stoichiometry Toward the Properties of Covalent Network Glasses. Front. Mater. 6:180. doi: 10.3389/fmats.2019.00180
    Journal
    FRONTIERS IN MATERIALS
    Rights
    © 2019 Lucas. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Trends in density and fragility are analyzed in the Ge-As-Se, As-Se, and Ge-Se systems for the purpose of identifying correlations with structural characteristics related to topology, stoichiometry, and dimensionality. The Ge-As-Se system provides the most revealing testbed as it permits to isolate individual effects. The fragility of Ge-As-Se glasses is clearly controlled by stoichiometric factors while the topological transition at <r> = 2.4 is not observed in this system. The density of Ge-As-Se glasses broadly increases with average coordination but show two anomalies centered near <r> = 2.4 and 2.67. These anomalies merge into a single extremum corresponding to stoichiometric compositions when plotted against excess/deficiency in Se, thereby revealing their common link to stoichiometric factors. Nevertheless, when stoichiometric factors are fixed, dimensional effects are revealed in the form of a linear dependence upon content of tetrahedral Ge. Similarly, a diffuse maximum at the topological transition of <r> = 2.4 is observed when only Se-excess compositions are considered. For the As-Se system, a local maximum in fragility is observed at the two dimensional composition As2Se3 contrary to predictions from topological or stoichiometric factors, thereby indicating that dimensional effect control the fragile behavior. Finally, in the Ge-Se system, a topological transition associated with balance of constraints and degrees of freedom is found at <r> = 2.4 when contributions from stoichiometry, and dimensionality are absent. In all systems, no case is found where topological effects dominate either stoichiometric or dimensional effects, hence it can be concluded that it is the least predominant contribution while stoichiometry is found to be the prevailing effect.
    Note
    Open access journal
    ISSN
    2296-8016
    DOI
    10.3389/fmats.2019.00180
    Version
    Final published version
    Sponsors
    NSF-DMR [1832817]
    ae974a485f413a2113503eed53cd6c53
    10.3389/fmats.2019.00180
    Scopus Count
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    UA Faculty Publications

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