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DMR-0305199

DMR-0305199 Collaborative Research: Structure-Property Relationships of Novel Rare Earth-Ultraphosphate Glasses Kanishka Marasinghe Dept. of Physics, University of North Dakota (UND) Collaborator: Richard K. Brow Dept. of Ceramic Engineering, University of Missouri-Rolla (UMR)

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DMR-0305199

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  1. DMR-0305199 Collaborative Research: Structure-Property Relationships of Novel Rare Earth-Ultraphosphate Glasses Kanishka Marasinghe Dept. of Physics, University of North Dakota (UND) Collaborator: Richard K. Brow Dept. of Ceramic Engineering, University of Missouri-Rolla (UMR) Program Goal: Develop a comprehensive understanding of the relationships between the composition, structure, and properties (magnetic and optical) of novel rare earth-phosphate glasses. During the past year, analysis of Neutron Diffraction (ND) and X-Ray Absorption (XAS) data was completed. Final analysis of High Energy X-ray Diffraction (HEXRD) data is now underway. A structural model based on information obtained from above three techniques for rare earth phosphate glasses is being refined. Figures:High quality RE LIII-edge (RE  Pr, Nd, Sm, Gd, Eu, Er) XAS data measured at the Advanced Photon Source, Argonne National Laboratory, has allowed us to obtain reliable radial distribution functions and RE-O and RE-P coordination numbers. Figures at right show the radial distribution function (top) for a glass of composition 20Nd2O3-80P2O5 (mol%) and the dependence of the Nd-O coordination number (bottom) on the Nd2O3 content in the ultra to meta phosphate transition region.

  2. Outreach Activities and Student Involvement Our laboratory has become the primary attraction for showcasing physics research at UND to region’s K-12 students. Students from schools as far away as 150 miles visit with us often. At right: a group of students from a rural high school in North Dakota and their physics teacher enjoying a snack during a recent visit. Our research group’s collaborations with scientists at the Argonne National Laboratory (ANL) allowed this summer’s Physics REU students to visit ANL and observe closely several exciting experiments. At left: REU students with two graduate students and the ANL tour guide in front of the Advanced Photon Source.Two graduate students of our group earned their M.S. degrees this summer. They are now at Argonne and Oak Ridge National Laboratories conducting their Ph.D. dissertation research. Currently, two Ph.D. students and an undergraduate student are working on this project.

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