Glasses, Optical Materials, and Devices: Current Issues in Science & Technology: ACerS GOMD Alfred R. Cooper Award Session
Program Organizers: Jincheng Du, University of North Texas; S. Sundaram, Alfred University
Tuesday 2:00 PM
October 1, 2019
Location: Oregon Convention Center
Session Chair: Steve Martin, Iowa State University; Kathleen Richardson, University of Central Florida
2:00 PM Invited
Cooper Distinguished Lecture: Function-tailoring Strategies for Broadband Infrared Glasses: Kathleen Richardson1; 1University of Central Florida
The challenge for next generation optical systems is to realize robust performance that is often multi-spectral. This requires broadband optical material solutions that perform in diverse environments where optical function plus thermo-mechanical robustness in a small package, is often required. Glasses and crystals have traditionally been used in applications where their singular wavelength and/or temperature behavior defines their specific function (such as focusing of a lens or diffraction of a grating). This often leads to complicated, multi-element designs that are costly and with infrared materials, heavy and sometimes challenging to fabricate. We present results of efforts that examine the ability to tailor this type of function for example applications across a range of glass and glass ceramic compositions. We discuss how promising optical and mechanical functionality can be tailored through ‘effective’ property engineering, and show how the use of transparent glass ceramics can provide design options enabling new optical systems.
2:40 PM Invited
2019 Alfred R. Cooper Young Scholar Award Presentation: Topological Constraint Model of High Lithium Content Borate Glasses: Wataru Takeda1; 1Coe College
Lithium borate glasses exhibit the “boron anomaly” and clustering of the lithium ions. Bødker et.al (Bødker, Mauro, Youngman, & Smedskjaer, 2019) predicted the Tg using statistical mechanics and topological constraint theory (TCT) over a wide range of lithium contents (up to 65 mol. % Li2O). Although Bødker’s model predicted the fraction of the structures present, this paper examines the linkage between intermediate-range structures and properties of the glasses. Tg was found using TCT with the structural model of Feller, Dell, and Bray (Feller, Dell, Bray, 1982). The topology of the intermediate-range structure was related to rigidity, and to lithium clustering.
3:20 PM Invited
Thin-film Glassy Solid Electrolytes: A New Functionality for Glass Enabling High Energy Density Li and Na Batteries: Steve Martin1; Steven Kmiec1; Guantai Hu1; Ran Zhao1; Ryan Gebhardt1; Adriana Joyce1; Dmitriy Bayko1; Onel Valdez1; Jacob Lovi1; 1Iowa State University
Fast ion conducting glasses have long been considered as alternatives to flammable liquid electrolytes in Li and Na batteries. However, to date, there has never been before the unique combination of required electrochemical properties for use as a solid electrolyte with the equally important requirements of viscoelastic behavior to form them into thin films suitable for low resistance separators. In this first ever report of thin film fast ion conducting glass, we will summarize our efforts to produce thin films of Li and Na ion conducting glasses and test in them in symmetric and asymmetric cells.
3:50 PM Invited
Glass Contributions to Advances in Nuclear Energy: Charmayne Lonergan1; Jarrod Crum1; Josef Matyas1; John Vienna1; 1Pacific Northwest National Laboratory
A future with clean, sustainable, and diverse energy sources cannot occur without taking advantage of nuclear power. A key issue for nuclear energy is the resulting waste where treatment and disposal of waste streams may be upwards of ~1/3 of the overall cost. Advances in glass science and engineering help pave the way for reduced waste treatment timelines and disposal costs to immobilize radioactive waste into stable forms. Materials were developed to optimize waste form properties including waste loading as well as improve capture and retention of volatile components such as I and Tc during vitrification. Current efforts include work that capitalizes on the functionality of various oxide and non-oxide glasses to increase efficiency of operational processes, reduce processing costs and resources required for operation of vitrification plants, as well as providing highly durable and stable waste forms. Topics from enhanced waste loading in phosphate glasses to reducing uncertainty in borosilicate waste glass formulation models will be discussed as well as how these advances help make nuclear power more viable and robust for future use.
4:20 PM Invited
Electrical Conduction in Metal-doped Chalcogenide Glasses: Kirtankumar Dixit1; David Drabold1; Gang Chen1; 1Ohio University
Glasses are usually good electrical insulators. However, upon addition of metal ions into chalcogenide glasses, the materials become not only ionically conducting but also, sometimes, electrically conducting. This unusual electrical property is the basis behind the Conductive-bridging Random Access Memory (CBRAM), a type of resistive random access memory that shows threshold switching in resistance under external electrical disturbance. To understand the structure and electrical property relation of metal-doped chalcogenide glasses, we synthesized Ag and Cu-doped Ge-Se thin films and CBRAM devices by magnetron sputtering. The electrical property was studied as a function of metal concentration and correlated with the structure of the materials obtained by X-ray scattering. MD simulations were also performed to understand the correlation between the atomic structure and the observed unusual electrical property. Our study sheds light on the origin of electric-field-induced conduction in CBRAM devices.