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in creator/contributor: "Peterson, E. J."

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The use of BaF sub 2 buffer layers for the sputter-deposition of TlCaBaCuO thin-film superconductors

Thin films of the Tl-based superconductors often have relatively poor properties because of film/substrate interdiffusion which occurs during the anneal. We have therefore investigated the use of BaF{sub 2} as a diffusion barrier. TlCaBaCuO thin films were deposited by dc magnetron sputtering onto MgO <100> substrates, both with and without an evaporation-deposited BaF{sub 2} buffer layer, and post-annealed in a Tl over-pressure. Electrical properties of the films were determined by four-point … more

Date: January 1, 1989

Creator: Hubbard, K. M.; Arendt, P. N.; Brown, D. R.; Cooke, D. W.; Elliott, N. E.; Farr, J. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser deposition and laser modification of high-temperature superconducting thin films

Applications of high-temperature superconductors (HTSC) may require epitaxial films with {Tc}{ge}77 K, and J{sub c}{ge}10{sup 6} A/cm{sup 2}. In situ pulsed laser deposition (PLD) is suitable for fabrication of such films. We report parametric studies on the effect of laser and processing parameters on the crystallinity, epitaxy and electrical properties of laser-deposited HTSC thin films. In addition, several laser-based processes were used to modify the electrical properties ({Tc} and J{sub c… more

Date: January 1, 1991

Creator: Dye, R. C.; Foltyn, S. R.; Nogar, N. S.; Wu, X. D.; Peterson, E. J. & Muenchausen, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Some chemical and mineralogical considerations important for understanding leachate chemistry

Both the raw shale material and the retorting process parameters are influential in determining the subsequent behavior of the spent shale solids with respect to leaching and/or environmental weathering. The process parameters define the mineral reactions that occur to form the mineral assemblage in the spent shale, while the major and trace element residences and mobilities from the raw shale determine the extent of incorporation of these elements in the spent shale matrix and ultimately the c… more

Date: January 1, 1982

Creator: Peterson, E. J. & Wagner, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Influence of chemical characterization of oil shale solids on understanding water quality impacts

Synfuels technologies will yield products and effluents that are a function of the raw material being processed and the process variables. Chemical and mineralogic characterization of solids generated in synfuels production provide valuable insight into health and environmental impacts associated with synfuels processing (coal liquefaction or gasification and shale oil extraction). This report deals with considerations relating to leachate generation from solid wastes, but the suggested researc… more

Date: January 1, 1981

Creator: Peterson, E. J. & Wagner, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Los Alamos environmental activities/oil shale effluents

The objectives of this research are to determine the nature, magnitude, and time dependence of the major and trace element releases as functions of the raw shale mineralogy, retorting conditions, and spent shale mineral assemblages. These experimental studies will focus on retorting variable regimes characteristic of most retorting processes. As an adjunct objective, the relation of laboratory results to those obtained from both bench-scale and pilot-scale retorts, when both have been operated … more

Date: January 1, 1985

Creator: Peterson, E. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Assessment and control of water contamination associated with shale oil extraction and processing. Progress report, October 1, 1979-September 30, 1980

The Los Alamos National Laboratory's research on assessment and control of water contamination associated with oil shale operations is directed toward the identification of potential water contamination problems and the evaluation of alternative control strategies for controlling contaminants released into the surface and underground water systems from oil-shale-related sources. Laboratory assessment activities have focused on the mineralogy, trace element concentrations in solids, and leaching… more

Date: April 1, 1982

Creator: Peterson, E. J.; Henicksman, A. V.; Fox, J. P.; O'Rourke, J. A. & Wagner, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Physical and chemical characterization and comparison of solids, liquids, and oils derived from Estonian and Green River formation shales

Although only a single Estonian raw shale sample with an unknown history has been examined, physical and chemical characterization of this material has been accomplished. A comparison with a representative Green River formation raw shale has been made. Some of the findings are: (1) Elemental analysis indicates that the major elements, aluminum, magnesium, and sodium are deficient in Estonian shale compared to the Green River shale. The minor elements, barium and strontium, and the trace element… more

Date: January 1, 1981

Creator: Peterson, E. J. & Spall, W. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New approaches to the study of lanthanide/actinide chloride: aluminum chloride vapor phase complexes

The spectrophotometric technique for vapor density measurements of complexed metal ions has been reformulated to account for temperature dependent effects and multi-species systems. Analysis of vapor pressure information indicates that the NdCl/sub 3/--AlCl/sub 3/ and HoCl/sub 3/--AlCl/sub 3/ systems are adequately explained by the existence of three vapor species. The two higher molecular weight complexes LnAl/sub 4/Cl/sub 15/ and LnAl/sub 3/Cl/sub 12/ were first proposed by Oeye and Gruen. Th… more

Date: January 1, 1979

Creator: Peterson, E. J.; Caird, J. A.; Carnall, W. T.; Hessler, J. P.; Hoekstra, H. R. & Williams, C. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The development of robotics for the determination of actinide and lanthanide distribution ratios

A Zymate II-PyTechnology robotics system was acquired to automate solvent extraction experiments. The system is designed to make the appropriate solutions, pre-equilibrate the liquid phases, perform the desired extraction, and detect and quantitate the metal ions in each phase. The solution preparation operations include weighing the solutes on an analytical balance, adding the solvent, and mixing the resulting solution. Aqueous solution pH adjustment is automatically made by the robot. Extract… more

Date: January 1, 1987

Creator: Nekimken, H. L.; Smith, B. F.; Peterson, E. J.; Hollen, R. M.; Erkkila, T. H. & Beugelsdijk, T. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Barium potassium bismuth oxide: Synthesis and physical properties

A series of compounds Ba/sub 1/minus/x/K/sub x/BiO/sub 3/ have been prepared and characterized over the range of compositions ranging from x = 0.3 to 0.5. A neutron powder diffraction analysis has been carried out for the composition x = 0.4 at room temperature and at 10 K. Examination of the superconducting properties as a function of x indicates superconductivity occurs over a narrow range of compositions close to x = 0.4, with T/sub c/ of 29 K. Specific heat measurements indicate conventiona… more

Date: January 1, 1989

Creator: Ott, K. C.; Hundley, M. F.; Kwei, G. H.; Maley, M. P.; McHenry, M. E.; Peterson, E. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of inherently safe and environmentally acceptable intelligent processing technologies for HTS materials

The development of new processing technologies for the production, fabrication, and application of advanced materials proceeds through several complementary dimensions. The advanced materials dimension includes basic research on materials synthesis, composition, and properties; materials processing research; engineering characterization and materials applications; and product and process engineering. The health and environmental dimension includes identification of potential health and environm… more

Date: January 1, 1989

Creator: Peterson, E. J.; Wangen, L. E.; Ott, K. C.; Muenchausen, R. E. & Parkinson, W. J. (Los Alamos National Lab., NM (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Retort abandonment: issues and research needs

This paper has identified key issues in retort abandonment and has addressed research needs. Retort abandonment for vertical modified in-situ (VMIS) shale oil recovery is an environmentally sensitive research area that has received recognition only within the past five years. Thus, experimental data and information are, in general, limited. In addition, there is presently a wide spectrum of unresolved issues that range from basic problem definition to technical details of potential control tech… more

Date: August 1, 1980

Creator: Fox, J. P.; Persoff, P.; Wagner, P. & Peterson, E. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Correlation of mineralogy and trace element leaching behavior in modified in situ spent shales from Logan Wash, Colorado

Oil shale retorting induces mineral and chemical reactions to occur on the macroscopic and microscopic levels in the kerogen-bearing marlstone. The nature and extent of the reactions is dependent upon process variables such as maximum temperature, time at temperature, atmosphere, and raw shale composition. This report describes the investigation of the mineral, chemical, and trace element release properties of spent shales retrieved from an experimental in situ retort at Occidental Oil Shale, I… more

Date: January 1, 1981

Creator: Peterson, E. J.; O'Rourke, J. A. & Wagner, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Control strategies for mitigation of oil-shale-related-water quality concerns

A comprehensive study of in situ retorting at the Logan Wash has indicated the importance of developing baseline information including raw shale characterization, the elucidation of mineralogical and chemical controls on trace element mobilities from shales subjected to in situ processing, and the research necessary to identify strategies for control of recognized environmental impacts. It is impossible to assess the magnitude of trace element releases to be expected from a commercial in situ f… more

Date: January 1, 1981

Creator: Peterson, E. J. & Wagner, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Carbonation of cerium oxychloride

Cerous carbonates can be used in thermochemical cycles for H production if the resulting ceric oxides can be converted back into cerous carbonates. One way is to reduce and hydrolyze ceric oxide with HCl to produce CeOCl and then to carbonate it. The reaction 3CeOCl + 3CO/sub 2/ + 8H/sub 2/O ..-->.. CeCl/sub 3/(aq) + Ce/sub 2/ (CO/sub 3/)/sub 3/ . 8H/sub 2/O was found to occur in aqueous medium if the final CeCl/sub 3/ content is low. Carbonation of CeOCl could also be conducted in acetone --H/… more

Date: January 1, 1977

Creator: Peterson, E. J.; Onstott, E. I. & Bowman, M. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Targetry at the LANL 100 MeV Isotope Production Facility: Les-Sons Learned From Facility Commissioning

The new Isotope Production Facility (IPF) at Los Alamos National Laboratory has been commissioned during the spring of 2004. Commissioning activities focused on the establishment of a radionuclide database, the review and approval of two specific target stack designs, and four trial irradiation runs with subsequent chemical processing and data analyses. This paper highlights some aspects of the facility and the targetry of the two approved target stacks used during the commissioning process.

Date: October 5, 2004

Creator: Nortier, F. M.; Fassbender, M. E.; DeJohn, M.; Hamilton, V. T.; Heaton, R. C.; Jamriska, D. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radionuclide Inventory Management at the New 100 MeV Isotope Production Facility at LANL

The Isotope Production Facility (IPF) at Los Alamos is operated on the authorization basis of a radiological facility with an inventory limit of a Category 3 Nuclear Facility. For the commissioning of IPF, a ''dummy'' target stack containing Zn, Nb and Al disks, and a ''prototype'' stack were irradiated with a proton beam. The ''prototype'' stack contained two pressed RbCl disks, encapsulated in stainless steel, and a Ga metal target. Typical ''prototype'' stack beam parameters were 88.9 {micro… more

Date: October 3, 2004

Creator: Fassbender, M. E.; Phillips, D. R.; Nortier, F. M.; Trellue, H. R.; Hamilton, V. T.; Heaton, R. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Spectrophotometric studies of holmium(III) chloride-aluminum(III) chloride vapor complexes

The gas complexation reactions between LnCl/sub 3/ and Al/sub 2/Cl/sub 6/ to yield molecular species of the form LnCl/sub 3/ (Al/sub 2/Cl/sub 6/)/sub x/ have been studied for a number of years. The spectrophotometric technique has been used to deduce the thermodynamic properties of the molecular species. We have studied the HoCl/sub 3/ (Al/sub 2/Cl/sub 6/)/sub x/ system from 600 to 900/sup 0/K and at Al/sub 2/Cl/sub 6/ pressures between 1 and 7 atm. The Ho/sup 3 +/ hypersensitive transition bet… more

Date: January 1, 1980

Creator: Williams, C. W.; Hessler, J. P. & Peterson, E. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigations of fluctuations in instrumental responses by principal components analysis

Principal components analysis was evaluated as a chemometric method for investigating the sources of variation in multicomponent analytical instruments. Many measurements of a 20-element standard were made over several days of operation with a direct-current argon plasma emission spectrometer designed to simultaneously measure the emission intensity at 20 analytical wavelengths. The number of components necessary to account for signal variations and the interelement correlations were determined… more

Date: January 1, 1985

Creator: Wangen, L. E.; Bentley, G. E.; Hamilton, V. T. & Peterson, E. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spallation Production of Neutron Deficient Radioisotopes in North America

The US Department of Energy produces a number of neutron deficient radioisotopes by high energy proton induced spallation reactions in accelerators at Los Alamos National Laboratory in New Mexico and Brookhaven National Laboratory in New York. Research isotopes are also recovered from targets irradiated at TRIUMF in British Columbia, Canada. The radioisotopes recovered are distributed for use in nuclear medicine, environmental research, physics research, and industry worldwide. In addition to t… more

Date: December 31, 1997

Creator: Jamriska, D. J.; Peterson, E. J. & Carty, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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DIELECTRIC PROPERTIES OF BA(0.6)SR(0.4)TiO(3) THIN FILMS WITH VARIOUS STRAIN STATES

We could systematically control the strain states of a Ba{sub 0.6}Sr{sub 0.4}TiO{sub 3} film by depositing a very thin Ba{sub 1{minus}x}Sr{sub x}TiO{sub 3} interlayer between the main layer of the Ba{sub 0.6}Sr{sub 0.4}TiO{sub 3} and a MgO(001) substrate. Ba{sub 0.6}Sr{sub 0.4}TiO{sub 3} films showed very strong dependence of dielectric properties on the strain states. The strain induced by the MgO substrate was relaxed faster than that induced by an interlayer.

Date: April 2001

Creator: Park, B. H.; Peterson, E. J.; Lee, J.; Zeng, X.; Si, W.; Xi, X. X. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Growth and magnetic structure of La{sub 0.67}Sr{sub 0.33}MnO{sub 3} films

Growth of LaMnO{sub 3} films that exhibit colossal magnetoresistance (CMR) has concentrated heavily on Ca doped materials. However, since the 33% Sr doped films are ferromagnetic at room temperature, they are ideal candidates for dual growth-magnetic structure studies using scanned probe techniques. In this study, interest was focused on the relations between growth/processing parameters, film morphology, and electronic/magnetic properties. In addition, films were grown on both LaAlO{sub 3} (LA… more

Date: August 1, 1997

Creator: Brown, G. W.; Jia, Q. X.; Peterson, E. J.; Hristova, D. K.; Hundley, M. F.; Thompson, J. D. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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PHASE DIAGRAM STUDIES IN THE SrO-CuO-TiO(2) SYSTEM; APPLICATIONS TO YBCO COATED CONDUCTORS

No Description Available.

Date: December 1, 2001

Creator: Ayala, A.; Holesinger, T. G.; Peterson, E. J. & Archuleta, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Surface Modification of AISI-4620 Steel With Intense Pulsed Ion Beams

A 300-keV, 30-kA, 1-{micro}s intense beam of carbon, oxygen, and hydrogen ions is used for the surface treatment of AISI-4620 steel coupons, a common material used in automotive gear applications. The beam is extracted from a magnetically-insulated vacuum diode and deposited into the top 1 {micro}m of the target surface. The beam-solid interaction causes a rapid melt and resolidification with heating and cooling rates of up to 10{sup 10} K/sec. Treated surfaces are smoothed over 1-{micro}m scal… more

Date: September 1, 1996

Creator: Rej, D. J.; Davis, H. A.; Nastasi, M.; Olson, J. C.; Peterson, E. J.; Reiswig, R. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department