Search Results - "Gregory R. Lumpkin"

Perspectives on Pyrochlores, Defect Fluorites, and Related Compounds: Building Blocks for Chemical Diversity and Functionality by Lumpkin, Gregory R, Aughterson, Robert D

“…In this article we provide some perspectives on a range of pyrochlore and defect fluorite type compounds with nominal A B O , A BO , ABC O , and other…”
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Gradual Structural Evolution from Pyrochlore to Defect-Fluorite in Y2Sn2―xZrxO7: Average vs Local Structure by ZHAOMING ZHANG, MIDDLEBURGH, Simon C, DE LOS REYES, Massey, LUMPKIN, Gregory R, KENNEDY, Brendan J, BLANCHARD, Peter E. R, REYNOLDS, Emily, JANG, Ling-Yun

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The In-Situ Quantification of Structural Radiation Damage in Zircon Using Laser-Induced Confocal Photoluminescence Spectroscopy by Christoph Lenz, Elena Belousova, Gregory R. Lumpkin

“…We present a new methodology for laser-induced steady-state photoluminescence (PL) spectroscopy of Dy3+ that aims at a direct quantification of the amorphous…”
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Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores by Gregg, Daniel J., Zhang, Zhaoming, Thorogood, Gordon J., Kennedy, Brendan J., Kimpton, Justin A., Griffiths, Grant J., Guagliardo, Paul R., Lumpkin, Gregory R., Vance, Eric R.

“…The incorporation of uranium into gadolinium zirconate (Gd2Zr2O7) is investigated by synchrotron X-ray powder diffraction and X-ray absorption near-edge…”
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Ion irradiation of novel yttrium/ytterbium-based pyrochlores: The effect of disorder by Whittle, Karl R., Blackford, Mark G., Aughterson, Robert D., Lumpkin, Gregory R., Zaluzec, Nestor J.

“…Pyrochlores based on the general composition Ln2TiO5 (Ln2.67Ti1.33O6.67) and Ln2Ti2O7, where Ln=Y or Yb, have been irradiated through the crystalline–amorphous…”
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The Quantification of Radiation Damage in Orthophosphates Using Confocal μ-Luminescence Spectroscopy of Nd3 by Lenz, Christoph, Thorogood, Gordon, Aughterson, Robert, Ionescu, Mihail, Gregg, Daniel J., Davis, Joel, Lumpkin, Gregory R.

“…In this study, we present a new concept based on the steady-state, laser-induced photoluminescence of Nd 3+ , which aims at a direct determination of the…”
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Insight Into Disorder, Stress and Strain of Radiation Damaged Pyrochlores: A Possible Mechanism for the Appearance of Defect Fluorite by Finkeldei, Sarah C., Chang, Shirley, Ionescu, Mihail, Oldfield, Daniel, Davis, Joel, Lumpkin, Gregory R., Simeone, David, Avdeev, Max, Brandt, Felix, Bosbach, Dirk, Klinkenberg, Martina, Thorogood, Gordon J.

“…We have examined the irradiation response of a titanate and zirconate pyrochlore—both of which are well studied in the literature individually—in an attempt to…”
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Microstructural Evolution of an Ion Irradiated Ni–Mo–Cr–Fe Alloy at Elevated Temperatures by Reyes, Massey de los, Edwards, Lyndon, Kirk, Marquis A., Bhattacharyya, Dhriti, Lu, Kim T., Lumpkin, Gregory R.

“…The irradiation behavior of a Ni–Mo–Cr–Fe alloy, of the type currently being considered for use in future molten salt cooled reactors, has been investigated in…”
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Profiling hot isostatically pressed canister–wasteform interaction for Pu‐bearing zirconolite‐rich wasteforms by Dayal, Pranesh, Farzana, Rifat, Zhang, Yingjie, Lumpkin, Gregory R., Holmes, Rohan, Triani, Gerry, Gregg, Daniel J.

“…Zirconolite‐rich full ceramic wasteforms designed to immobilize Pu‐bearing wastes were produced via hot isostatic pressing (HIP) using stainless steel (SS) and…”
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Crystal chemistry and ion‐irradiation resistance of Ln2ZrO5 compounds with Ln = Sm, Eu, Gd, and Tb by Aughterson, Robert D., Lumpkin, Gregory R., Zhang, Zhaoming, Avdeev, Maxim, Kong, Linggen

“…The previously unattained fabrication of single phase Ln2ZrO5 (Ln = Sm, Eu, Gd, and Tb) compounds via relatively low sintering temperature (1400°C) is achieved…”
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Crystal structures and phase transition in the system SrTiO3-La2/3TiO3 by HOWARD, Christopher J, LUMPKIN, Gregory R, SMITH, Ronald I, ZHAOMING ZHANG

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Structures and phase diagram for the system CaTiO3-La2/3TiO3 by ZHAOMING ZHANG, LUMPKIN, Gregory R, HOWARD, Christopher J, KNIGHT, Kevin S, WHITTLE, Karl R, OSAKA, Keiichi

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Novel complex ceramic oxides, Ln2TiO5 (Ln = La, Sm, Gd, Tb, Dy, Ho, Er, and Yb), for polyphase nuclear waste‐forms by Aughterson, Robert D., Lumpkin, Gregory R., Smith, Katherine L., Cairney, Julie M.

“…As part of a broader study of ceramic nuclear waste‐forms, four different lanthanide titanates were fabricated; La0.1Sm0.1Gd0.1Tb0.1Dy0.3Ho0.1Er0.2YbTiO5,…”
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Micro-compression testing of gold ion irradiated zirconolite glass-ceramics as nuclear waste forms by Xu, Alan, Wei, Tao, Gregg, Daniel J., Vance, Eric R., Zhang, Yingjie, Lumpkin, Gregory R.

“…The mechanical properties of zirconolite glass-ceramics designed for immobilising actinide-rich nuclear wastes, have been investigated through…”
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Ion beam irradiation of ABO4 compounds with the fergusonite, monazite, scheelite, and zircon structures by Reyes, Massey, Aughterson, Robert D., Gregg, Daniel J., Middleburgh, Simon C., Zaluzec, Nestor J., Huai, Ping, Ren, Cuilan, Lumpkin, Gregory R.

“…The effects of irradiation on CaWO4, SrWO4, BaWO4, YVO4, LaVO4, YNbO4, and LaNbO4 were investigated on thin crystals using 1.0 MeV Kr ions at 50‐1000 K. All of…”
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Porous Zr2SC-carbon composite microspheres: Possible radiation tolerant sorbents and transmutation hosts for technetium-99 by Scales, Nicholas, Chen, Jun, Aughterson, Robert D., Karatchevtseva, Inna, Stopic, Attila, Lumpkin, Gregory R., Luca, Vittorio

“…The preparation, characteristics and adsorption properties of novel porous carbon-ceramic composite microspheres are presented. The composites were synthesised…”
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Uranium Sorption on Various Forms of Titanium Dioxide – Influence of Surface Area, Surface Charge, and Impurities by Comarmond, M. Josick, Payne, Timothy E, Harrison, Jennifer J, Thiruvoth, Sangeeth, Wong, Henri K, Aughterson, Robert D, Lumpkin, Gregory R, Müller, Katharina, Foerstendorf, Harald

“…Titanium dioxide (TiO2) has often served as a model substrate for experimental sorption studies of environmental contaminants. However, various forms of…”
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Alpha-decay damage and aqueous durability of actinide host phases in natural systems by Lumpkin, Gregory R.

“…This paper provides an overview of the geochemical alteration and alpha-decay damage effects observed in the titanate mineral phases brannerite, perovskite,…”
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Novel Chemical Synthesis and Characterization of CeTi2O6 Brannerite by Kong, Linggen, Gregg, Daniel J, Karatchevtseva, Inna, Zhang, Zhaoming, Blackford, Mark G, Middleburgh, Simon C, Lumpkin, Gregory R, Triani, Gerry

“…Cerium titanate CeTi2O6 was prepared by a new soft chemistry route in aqueous solution. A suite of characterization techniques, including X-ray diffraction,…”
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Raman spectroscopic study of natural and synthetic brannerite by Zhang, Yingjie, Karatchevtseva, Inna, Qin, Mengjun, Middleburgh, Simon C., Lumpkin, Gregory R.

“…Raman spectra of a well-characterized natural brannerite and some synthetic brannerite samples have been collected and analysed. For the first time, all 12…”
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