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Chemically Bonded Phosphate Ceramics for Radioactive and Mixed Waste Solidification and Stabilization

Description: Results of an initial investigation of low temperature setting chemically bonded magnesium ammonium phosphate (MAP) ceramics as waste form materials, for solidification and stabilization of radioactive and mixed waste, are reported. The suitability of MAP for solidifying and encapsulating waste materials was tested by encapsulating zeolites at loadings up to [approximately]50 wt%. The resulting composites exhibited very good compressive strength characteristics. Microstructure studies show that… more
Date: January 1993
Creator: Wagh, A. S.; Cunnane, J. C.; Singh, D.; Reed, D. T.; Armstrong, S.; Subhan, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Study of hydrocarbon--shale interaction. Progress report No. 1, July 1, 1976--October 1, 1976

Description: Work on Hydrocarbon-Shale Interaction at Juniata College from June 1, 1976 through September 30, 1976 is summarized. Work was accomplished in the following areas: constrictive and geometric effects associated with gas production from shale wells, diffusion constants, hydrocarbon gas analysis, adsorption isotherms and powder x-ray diffraction. A bibliography on adsorption and diffusion in shale was prepared and is included. A detailed description of the procedures used in construction and calibr… more
Date: January 1, 1976
Creator: Schettler, P. D. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemistry and structure of coal-derived asphaltenes: Phase I. Quarterly progress report, April--June 1976. [Fractionation into 5 fractions]

Description: Coal liquids from the three direct general processes for converting coal to liquid fuels, catalyzed hydrogenation, staged pyrolysis, and solvent refining, have been separated by solvent fractionation into five fractions. These fractions are propane-soluble (oil); propane-insoluble and pentane-soluble (resin); pentane-insoluble and benzene-soluble (asphaltene); benzene-insoluble and carbon disulfide-soluble (carbene); carbon disulfide-insoluble (carboid). The great majority of the suitable fract… more
Date: January 1, 1976
Creator: Schwager, I.; Farmanian, P.; Kwan, J.; Louie, S.; Sanders, D. & Yen, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemistry and structure of coal-derived asphaltenes, Phase II. Quarterly progress report, July--September 1976

Description: Additional elemental analyses and molecular weight determinations have been carried out on the various components of the solvent fractionated coal liquids from the three direct general processes for coal liquefaction. The atomic C/H ratios are found to increase in the direction carboid greater than asphaltene greater than coal. Completed chromatography of asphaltenes on silica gel and Amberlyst-15 indicates that basic and non-basic asphaltene components may be separated into two major fractions… more
Date: January 1, 1976
Creator: Yen, T. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Basic research on ceramic materials for energy storage and conversion systems. Progress report, December 1, 1975--November 30, 1976. [Tl/sub 2/ZnI/sub 2/, In/sub 4/CdI/sub 6/, Tl/sub 4/CdI/sub 6/, and In/sub 2/ZnI/sub 4/; solid electrolytes and electrodes]

Description: The present research program involves utilizing appropriate experimental probes for measuring the movement of ionic and electronic charge carriers in ceramic materials suitable for solid electrolyte and electrode applications in high-performance, secondary battery and fuel cell systems. Special emphasis is placed on developing: (1) a better understanding of the effects of structure, impurities and composition on charge carrier transport mechanisms in such materials; and (2) detailed knowledge o… more
Date: December 1, 1976
Creator: Whitmore, D. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemical and nuclear properties of lawrencium (element 103) and hahnium (element 105)

Description: The chemical and nuclear properties of Lr and Ha have been studied, using 3-minute {sup 260}Lr and 35-second {sup 262}Ha. The crystal ionic radius of Lr{sup 3+} was determined by comparing its elution position from a cation-exchange resin column with those of lanthanide elements having known ionic radii. Comparisons are made to the ionic radii of the heavy actinides, Am{sup 3+} through Es{sup 3+}, obtained by x-ray diffraction methods, and to Md{sup 3+} and Fm{sup 3+} which were determined in t… more
Date: September 10, 1990
Creator: Henderson, Roger Alan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-level waste-basalt interactions. Annual progress report, February 1, 1977--September 30, 1977

Description: Commercial radioactive waste can be placed under ground in a basalt repository to contain significant amounts of radioactive decay heat for the first hundred or so years, which constitutes the ''thermal period'' of waste isolation, if the feasibility is determined that a basalt geology is a suitable medium for storage of radioactive wastes. Several physical-chemical changes analogous to natural geochemical processes can occur in and around this repository during the thermal period. The waste ca… more
Date: May 1, 1978
Creator: McCarthy, G.J. & Scheetz, B.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of the solid product(s) formed when UF/sub 6/ is released into ambient air in a contained volume (U)

Description: Preliminary characterization of the plume or cloud produced by the release of UF/sub 6/ into humid air and the particulates comprising this cloud has been accomplished. The explosive release was conducted in a vessel in which the air at atmospheric pressure was static and the particulate material was collected on microscope grids by gravitational settling. Transmission and Scanning Electron Microscopy (TEM and SEM) have been used to determine the size or range of sizes of the particles produced… more
Date: May 7, 1980
Creator: Pickrell, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental studies of stress distributions and stress relaxation in oxide scales on high temperature alloys

Description: The high temperature X-ray diffraction system developed for this program is being used to measure the strains which develop during oxidation. This is being applied to Ni/NiO and Cr/Cr[sub 2]O[sub 3]. Our work suggests tat the oxide and metal crystalline texture, anisotropic elastic modulus and anisotropic thermal expansion can have a pronounced effect on strain state of these systems. Acoustic emission is being used to study oxide scale failure (fracture) during oxidation. AE data from 304 stai… more
Date: June 1, 1992
Creator: Shores, D.A.; Stout, J.H. & Gerberich, W.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Diffractive Hard Scattering

Description: I discuss events in high energy hadron collisions that contain a hard scattering, in the sense that very heavy quarks or high P/sub T/ jets are produced, yet are diffractive, in the sense that one of the incident hadrons is scattered with only a small energy loss. 8 refs.
Date: March 1, 1986
Creator: Berger, E. L.; Collins, J. C.; Soper, D. E. & Sterman, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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[Atomic beam studies of the interaction of hydrogen with transition metal surfaces]. Technical progress report, August 1, 1985--July 30, 1992

Description: We have constructed two experimental facilities during the term of this grant. In the first three years we constructed a helium atom scattering (HAS) facility with both elastic (EHAS) and inelastic (IHAS) scattering measurement capabilities to investigate the structural and dynamical aspects of solid surfaces and thin films. A pioneering surface metastable atom magnetic diffraction (SMAMD) facility was constructed and developed over the past four years, which makes possible the investigation of… more
Date: December 31, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fifth Annual Meeting of the Advanced Light Source User`s Association

Description: This report discusses the following topics: ALS Project Status; Accelerator Commissioning; Experimental Systems: Supersmooth Optics and Ultra-Precise Undulators; Planning for Users and User Services; ALS Scientific Program; High Resolution Core-Level Photoemission; Photoelectron Diffraction and Holography; Soft X-Ray Emission Spectroscopy of Solids at the NSLS and the ALS; Gas-Phase Spectrometry; Spectromicroscopy; X-Ray Dichroism Experiments Using Circular Polarization; Magnetic Circular X-Ray… more
Date: October 1, 1993
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Durability of simulated DWPF annealed glasses

Description: Simulated high-level waste glass samples of the DWPF projected compositions were annealed at various times and temperatures in order to develop time-temperature-transformation diagrams. These heat treated glasses were subjected to the Product Consistency Test (PCT) to evaluate glass durability. The B, Li, and Na concentrations in the leachate (the PCT results) were compared to the PCT results of the Environmental Assessment benchmark glass. Durability as a function of glass composition and crys… more
Date: March 1, 1993
Creator: Andrews, M. K.; Cicero, C. A.; Marra, S. L. & Beam, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, April--June 1991

Description: The objective of this project is to pursue the development of highly dispersed and inexpensive catalysts for improved coal solubilization and upgrading of coal liquids. A novel study of the synthesis of liquefaction catalysts of nanometer size will be carried out. It is based on the molecular design of reverse micelles (microemulsions). These surfactant-stabilized, metal-bearing microdrops offer unique opportunities for synthesizing very small particles by providing a cage-like effect that limi… more
Date: July 1, 1991
Creator: Osseo-Asare, K. & Radovic, L. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Techniques for mapping the types, volumes, and distribution of clays in petroleum reservoirs and for determining their effects on oil production. Final report

Description: This report presents the results of correlation of log signatures with information on distribution of the types and volumes of clays in sandstone pore spaces determined from detailed CT-scan, XRD, SEM, and thin section analyses of core samples from three sandstone reservoirs. The log signatures are then analyzed to determine if suitable mathematical/statistical parameter(s) could be calculated from the logs to determine their effects on permeability and oil production. The variability measures … more
Date: May 1, 1993
Creator: Sharma, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development & Optimization of Materials and Processes for a Cost Effective Photoelectrochemical Hydrogen Production System

Description: The overall project objective was to apply high throughput experimentation and combinatorial methods together with novel syntheses to discover and optimize efficient, practical, and economically sustainable materials for photoelectrochemical production of bulk hydrogen from water. Automated electrochemical synthesis and photoelectrochemical screening systems were designed and constructed and used to study a variety of new photoelectrocatalytic materials. We evaluated photocatalytic performance … more
Date: January 17, 2011
Creator: McFarland, Eric W.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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DEVELOPMENT OF CERAMIC WASTE FORMS FOR AN ADVANCED NUCLEAR FUEL CYCLE

Description: A series of ceramic waste forms were developed and characterized for the immobilization of a Cesium/Lanthanide (CS/LN) waste stream anticipated to result from nuclear fuel reprocessing. Simple raw materials, including Al{sub 2}O{sub 3} and TiO{sub 2} were combined with simulated waste components to produce multiphase ceramics containing hollandite-type phases, perovskites (particularly BaTiO{sub 3}), pyrochlores and other minor metal titanate phases. Three fabrication methodologies were used, i… more
Date: November 30, 2010
Creator: Marra, J.; Billings, A.; Brinkman, K. & Fox, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Chemically bonded phosphate ceramics for radioactive and mixed waste solidification and stabilization

Description: Results of an initial investigation of low temperature setting chemically bonded magnesium ammonium phosphate (MAP) ceramics as waste form materials, for solidification and stabilization of radioactive and mixed waste, are reported. The suitability of MAP for solidifying and encapsulating waste materials was tested by encapsulating zeolites at loadings up to {approximately}50 wt%. The resulting composites exhibited very good compressive strength characteristics. Microstructure studies show that… more
Date: January 1, 1993
Creator: Wagh, A. S.; Cunnane, J. C.; Singh, D.; Reed, D. T.; Armstrong, S.; Subhan, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1990

Description: The objective of this project is to pursue the development of highly dispersed and inexpensive catalysts for improved coal solubilization and upgrading of coal liquids. A novel study of the synthesis of liquefaction catalysts of nanometer size will be carried out. It is based on the molecular design of reverse micelles (microemulsions). These surfactant-stabilized, metal-bearing microdrops offer unique opportunities for synthesizing very small particles by providing a cage-like effects that lim… more
Date: February 1, 1991
Creator: Osseo-Asare, K. & Radovic, L. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Imaging of surface structure with energy-dependent photoelectron diffraction

Description: Energy-dependent photoelectron diffraction (EDPD) has been used to determine the surface structure of a surface alloy. Direct imaging has been achieved by Fourier transformation of experimental energy-dependent photoelectron diffraction data. This holographic method, based upon the intersection of contour arcs associated with each measurement direction, can provide vectorial atomic positions with atomic resolution. Experimental analysis is supported by Fourier transformation of simulations from… more
Date: August 5, 1993
Creator: Tobin, J. G.; Waddill, G. D.; Li, Hua & Tong, S. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Membranes for H2 generation from nuclear powered thermochemical cycles.

Description: In an effort to produce hydrogen without the unwanted greenhouse gas byproducts, high-temperature thermochemical cycles driven by heat from solar energy or next-generation nuclear power plants are being explored. The process being developed is the thermochemical production of Hydrogen. The Sulfur-Iodide (SI) cycle was deemed to be one of the most promising cycles to explore. The first step of the SI cycle involves the decomposition of H{sub 2}SO{sub 4} into O{sub 2}, SO{sub 2}, and H{sub 2}O at… more
Date: November 1, 2006
Creator: Nenoff, Tina Maria; Ambrosini, Andrea; Garino, Terry J.; Gelbard, Fred; Leung, Kevin; Navrotsky, Alexandra (University of California, Davis, CA) et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New Metal Niobate and Silicotitanate Ion Exchangers: Development and Characterization

Description: This project is a continuing EMSP project entitled ''New Silicotitanate Waste Forms: Development and Characterization.'' In our original study, the phase selection and chemical durability of silicotitanates (including commercially available IE-911) as a function of temperature (500 to 1000 C) was fully characterized by a combination of techniques including XRD, TEM, SEM, NMR, Raman spectroscopy, XAFS, XANES, and by thermodynamic studies. In addition, work on this program led to new discoveries … more
Date: June 1, 2001
Creator: Su, Yali; Nenoff, Tina M. & Navrotsky, Alexandra
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MEASUREMENT OF NANOSTRUCTURES WITH MICROMACHINED MICROSCOPES

Description: We have made reproducible scanning probes with high efficiency, and predictable and reproducible character-istics. We obtained good efficiency with dimensions well below the diffraction limit, so that rela-tively small laser powers in the milliwatt range can be used. For single frequency operation, only low power is necessary to obtain very high fields for the excitation of well-defined Raman scattering, and to work in a reflection mode with good scanning speeds; obtained predictable results wi… more
Date: April 30, 2005
Creator: KINO, G.S. & MOERNER, W.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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