Structural Investigation of Oxy-thio Phosphate glasses and their Physical Properties
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The Symposium provides undergraduates from all academic disciplines with an opportunity to share their research with the university community and other guests through conference-style oral presentations. The Symposium represents part of a larger effort of Iowa State University to enhance, support, and celebrate undergraduate research activity.
Though coordinated by the University Honors Program, all undergraduate students are eligible and encouraged to participate in the Symposium. Undergraduates conducting research but not yet ready to present their work are encouraged to attend the Symposium to learn about the presentation process and students not currently involved in research are encouraged to attend the Symposium to learn about the broad range of undergraduate research activities that are taking place at ISU.
The first Symposium was held in April 2007. The 39 students who presented research and their mentors collectively represented all of ISU's Colleges: Agriculture and Life Sciences, Business, Design, Engineering, Human Sciences, Liberal Arts and Sciences, Veterinary Medicine, and the Graduate College. The event has grown to regularly include more than 100 students presenting on topics that span the broad range of disciplines studied at ISU.
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Abstract
The short-range order (SRO) structures of the Na4P2S (7-x) O(x), 0 ≤ x ≤ 7, glass system was investigated, using samples that were prepared with the ball milling technique. This glass series was explored using X-Ray diffraction (XRD), Raman, Fourier Transform infrared (FT-IR), and 31P Magic Angle Sample Spinning NMR (MAS NMR) spectroscopies to develop an understanding of how incorporating oxygen into the sulfide structure affects the physical properties. XRD was used to show that the ball milled samples can be prepared as completely amorphous materials, and the spectroscopy experiments combine to show that the materials are completely chemically reacted in the samples. The structual transformation caused by the incremental addition of oxygen can by seen in the progression from pyro-phosphate (P1) units to ortho-phosphate (P0) and meta-phosphate (P2) units. These structural changes can also be seen in the trends of the physical properties as the glass transition temperature increases and the ionic conductivity decreases.