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    Understanding and design of intermediate glass

    Author
    Sun, Ruofu
    View/Open
    179724_Sun_rpi_0185N_11566.pdf (5.719Mb)
    Other Contributors
    Huang, Liping; Tomozawa, Minoru; Shi, Yunfeng;
    Date Issued
    2019-08
    Subject
    Materials engineering
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/2419
    Abstract
    The most pronounced elastic anomalies that appear in silica and silica-rich glasses are the positive temperature derivative and negative pressure derivative of bulk modulus, as compared with normal glasses, such as window glass (soda-lime-silica) containing more network modifiers. It would be natural to imagine that there are intermediate glasses with elastic moduli that are independent of temperature and/or pressure. Such glasses would prove useful in designing athermal optical fibers for enhanced telecommunication, fiber sensing applications and in designing glass products for applications where a broad range of thermal and mechanical stimulation is expected. In this work, in-situ high temperature Brillouin light scattering were used to systematically study the composition effects on the thermal stability of aluminosilicate glasses (Na2O-Al2O3-SiO2 and CaO-Al2O3-SiO2 series) by varying the non-bridging oxygen (NBO) content, the network former content and the modifier type. Thermal annealing and hot compression near the glass transition temperature were also explored to understand how processing can further control the thermal stability of CaO-Al2O3-B2O3-SiO2 and Li2O-Al2O3-B2O3 glasses, by taking advantage of the sensibility of the coordination state and superstructure units associated with boron atom to temperature and pressure. Our study showed that the intermediate elastic behaviors come from a delicate balance between the stiffening effect associated with conformation changes in the medium range flexible rings and the softening effect due to the weakening of short range chemical bonds with temperature.;
    Description
    August 2019; School of Engineering
    Department
    Dept. of Materials Science and Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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