Structural role of nitrogen in phosphorus oxynitride glasses

<p>"This dissertation contains the results of six years of research on phosphorus oxynitride glasses. The main body is composed of three papers to be submitted for publication; the first on the preparation and properties of sodium ultraphosphate glasses, the second a review of the phosphorus oxynitride glasses, and the third a structural model for nitrogen incorporation. Appendices A, B, and C contain reprints of three articles co-authored by this author which have already been published in various journals.</p> <p>Appendix A, "Preparation of Phosphorus Oxynitride Glasses," published in the Journal of Non-Crystalline Solids in 1986 describes the preparation of oxynitride glass made by melting sodium metaphosphate in anhydrous ammonia gas. Changes in the dissolution rate in water, thermal expansion coefficient, dilatometric softening point and glass transition temperatures, refractive index, microhardness, and electrical conductivity are reported. Models are proposed for nitrogen dissolution in phosphate melts.</p> <p>Appendix B, "Structure of Phosphorus Oxynitride Glasses," published in the Journal of the American Ceramic Society in 1987 resulted from the collaboration of researchers at Sandia National Laboratories, University of Illinois-Urbana and myself at the University of Missouri-Rolla. This author prepared and measured various chemical and thermal properties for the samples used for the Nuclear Magnetic Resonance (NMR) and Raman measurements. The Raman analyses were performed at Sandia National Laboratories and the NMR spectra were measured at the University of Illinois-Urbana. Samples for the NMR measurements had to be prepared with ¹⁵N in the form of ¹⁵NH₃. Because of the expense of ¹⁵N ammonia, this author developed a recirculating atmosphere furnace and other equipment to produce these special samples. These are the first phosphorus oxynitride glasses ever prepared with ¹⁵N.</p> <p>Appendix C, "Oxygen Bonding in Nitrided Sodium- and Lithium-Metaphosphate Glasses," published in the Journal of Non-Crystalline Solids in 1988 resulted from joint work between myself at the University of Missouri-Rolla and Dr. R. K. Brow at Sandia National Laboratories. Samples prepared by this author were used for the x-ray photoelectron spectroscopy (XPS) measurements performed at Sandia National Laboratories. The XPS equipment was specially designed to collect spectra for structural analysis. The specimens were fractured in the ultra vacuum chamber of the XPS instrument in order to avoid surface contamination and damage which would obscure the structural information contained in the XPS spectra"--Abstract, pages iv-v.</p>

Name thesis:degree_name

Ph. D. in Ceramic Engineering

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Reidmeyer, Mary R.

• Ceramic Materials

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/677

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-1679