Title
High temperature infrared transmitting glasses based on the xBaS + yLa2S3 + (1-x-y)GeS2 glass system
Degree Type
Dissertation
Date of Award
2017
Degree Name
Doctor of Philosophy
Department
Materials Science and Engineering
Major
Materials Science and Engineering
First Advisor
Steve W. Martin
Abstract
Interest in chalcogenide glasses has been growing for decades. Unlike oxide glasses, sulfide glasses have large anions and weaker bonding. This sacrifices high melting and glass transition temperatures (Tg) for increased infrared transparency. While most research has been focused on increasing the infrared transparency of these materials little has been done to maximize both infrared transparency and Tg, but a new set of chalcogenide glasses built around ionic bonding schemes have shown promise in optimizing both of these properties. One application demanding such properties is chemical sensors for remote sensing in new advanced small modular nuclear reactors (AdvSMNRs) to detect trace amounts of gaseous compounds inside of the reactor environment.
This work focuses on understanding mechanisms that maximize Tg, infrared transparency, and gamma radiation resistance of three series of ionic sulfide glasses in the xBaS + yLa2S3 + (1-x-y)GeS2 system. Glasses prepared by sealing and melting stoichiometric amounts of sulfide compounds together in silica ampoules at 1150 ðC. These glasses achieve Tgs in excess of 550 ðC, have transmission window that expands from 0.5-10 μm. In addition, glasses show minimal transmission, density, and refractive index change after 453 kGy gamma radiation dose. This allows for the detection of infrared active molecules in the infrared spectrum at elevated temperatures making these strong candidates for chemical sensors in reactor environments.
Copyright Owner
Joshua Raymond Roth
Copyright Date
2017
Language
en
File Format
application/pdf
File Size
104 pages
Recommended Citation
Roth, Joshua Raymond, "High temperature infrared transmitting glasses based on the xBaS + yLa2S3 + (1-x-y)GeS2 glass system" (2017). Graduate Theses and Dissertations. 16204.
https://lib.dr.iastate.edu/etd/16204