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in subjects: "Palladium"

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Recovery of deformed and hydrogen-charge palladium

Positron lifetime and Doppler-broadening studies made at 300 K have been used to investigate the interaction between interstitial hydrogen and lattice defects in deformed Pd. Specimens were charged with hydrogen at 300 K to levels up to 0.1%. The presence of hydrogen was found to have no effect on the recovery curves of Pd upon annealing to 400/sup 0/C. By 400/sup 0/C the values for both lifetime and Doppler-broadening for both cold worked and cold worked plus hydrogen were below the values obt… more

Date: January 1, 1982

Creator: Snead, C. L. Jr.; Lynn, K. G. & Lynch, J. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Fast-neutron total and scattering cross sections of elemental palladium

Neutron total cross sections of palladium are measured from approx. = 0.6 to 4.5 MeV with resolutions of approx. = 30 to 70 keV at intervals of less than or equal to 50 keV. Differential neutron elastic- and inelastic-scattering cross sections are measured from 1.4 to 3.85 MeV at intervals of 50 to 100 keV and at 10 to 20 scattering angles distributed between approx. = 20 and 160/sup 0/. The experimental results are compared with respective quantities given in ENDF/B-V and used to deduce an opt… more

Date: June 1, 1982

Creator: Smith, A. B.; Guenther, P. T. & Whalen, J. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Interaction of noble-metal fission products with pyrolytic silicon carbide

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain layers of pyrolytic carbon and silicon carbide, which act as a miniature pressure vessel and form the primary fission product barrier. Of the many fission products formed during irradiation, the noble metals are of particular interest because they interact significantly with the SiC layer and their concentrations are somewhat higher in the low-enriched uranium fuels currently under consideration. To study fission product-… more

Date: January 1, 1982

Creator: Lauf, R. J. & Braski, D. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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RECOVERY OF PALLADIUM FROM NUCLEAR WASTE SOLUTIONS USING A PACKED COLUMN OF TRICAPRYL MONOMETHYL AMMONIUM CHLORIDE ON AN INERT SUPPORT.

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Date: October 31, 1969

Creator: Colvin, C.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Low cost hydrogen/novel membranes technology for hydrogen separation from synthesis gas, Phase 1. [Palladium-silver/poly(etherimide), polysulfone/poly(dimethylsiloxane)/poly(ether-esteramide)composite membranes]

During this quarter, work continued on the development of high-flux palladium-silver membranes for the separation of hydrogen from carbon dioxide. Palladium-silver/poly(etherimide) composite membranes were prepared by a vacuum sputtering technique. The influence of different poly(etherimide) support membranes on the performance of palladium-silver membranes was investigated. All membranes tested showed a hydrogen/carbon dioxide selectivity lower than that of the uncoated poly(etherimide)/poly(d… more

Date: January 1, 1987

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Catalyst and process development for hydrogen preparation from future fuel cell feedstocks. Quarterly progress report, January 1, 1980-March 31, 1980. [Pt/Rh, Pd, Pt, Rh, Ni/Rh, Rh/Re, Ni]

Catalysts are being screened to steam reform hydrocarbons in an autothermal reformer (STR). Twenty-one samples have been screened in a 1-in.-diam (ATR) reactor using No. 2 oil as the hydrocarbon feed. A series of platinum-rhodium catalysts were evaluated to study the effect of varying compositions. A sample containing 1.7% Pt/0.3% Rh was most active but the difference among the samples was within the range of test variability. Development of a more realistic test has been started. The effect of… more

Date: April 1, 1980

Creator: Yarrington, R M; Feins, I R & Hwang, H S

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Development of low cost contacts to silicon solar cells. Final report, 15 October 1978-30 April 1980

A summary of work done on the development of a copper based contact system for silicon solar cells is presented. The work has proceeded in three phases: (1) Development of a copper based contact system using plated Pd-Cr-Cu. Good cells were made but cells degraded under low temperature (300/sup 0/C) heat treatments. (2) The degradation in Phase I was identified as copper migration into the cells junction region. A paper study was conducted to find a proper barrier to the copper migration proble… more

Date: January 1, 1980

Creator: Tanner, D. P. & Iles, P. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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SANS (small angle neutron scattering) measurement of deuterium-dislocation correlation in palladium

Small angle neutron scattering (SANS) measurements have been made on deformed polycrystal palladium samples with and without deuterium dissolved in the solution phase ({alpha}) at room temperature. Concentrations were held constant during SANS experiments by an equilibrium gas pressure cell. The difference scattering cross section for the same sample with and without deuterium loading has a 1/Q behavior (Q=4{pi}/{lambda} sin{theta}/2) at intermediate values of Q. At very low values of Q the dep… more

Date: November 1, 1989

Creator: Heuser, B.J.; Summerfield, G.C.; King, J.S. (Michigan Univ., Ann Arbor, MI (USA)) & Epperson, J.E. (Argonne National Lab., IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Initial calorimetry experiments in the Physics Division, ORNL (Oak Ridge National Laboratory)

Four calorimetry experiments were performed with palladium cathode electrolysis cells to investigate the possibility of cold fusion heat production based on the reported results of Fleischmann and Pons. Two of the cells contained 6.35-mm-diam {times} 10-cm-long palladium cathodes in a 0.2-M {sup 6}LiOD electrolyte; one cell contained a similar cathode in a 0.1-M {sup 6}LiOD electrolyte solution; and one cell used a cast 1.27-cm-diam {times} 10-cm long palladium rod in a 0.2-M electrolyte. All f… more

Date: January 1, 1989

Creator: Hutchinson, D. P.; Bennett, C. A.; Richards, R. K.; Bullock IV, J. & Powell, G. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Kinetic and infrared study of the effect of metal crystallite size and metal-support interactions on CO hydrogenation reactions: a third-year progress report

Platinum and palladium supported on four different oxide materials - SiO/sub 2/, Al/sub 2/O/sub 3/, SiO/sub 2/-Al/sub 2/O/sub 3/, and TiO/sub 2/ - have been studied in depth. Different preparative techniques were utilized to vary metal particle size and change the state of the metal. For example, Pt and Pd deposited on TiO/sub 2/ and reduced at low temperatures (175 to 200/sup 0/C) exhibit normal adsorption behavior, whereas these same catalysts reduced at a high temperature (500/sup 0/C) trans… more

Date: January 1, 1980

Creator: Vannice, M. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Unit Operations Section Monthly Progress Report, November 1961

Openation of a 6-in.-dia foam separation column with Sr/sup 89/ tracer and dodecylbenzenesulfonate as a surfactant and foaming agent was continued. The catalytic oxidation of H/sub 2/, CO, and CH/sub 4/ was studied using a nickel- chromepalladium ribbon catalyst. A Mark I prototype fuel assembly was sheared to within 1.5-in. of the end by modifying the gas hydraulic system of the shear. The force required to shear a highly carburized Mark I fuel assembly ductile tubing. Demonstration of the mec… more

Date: May 16, 1962

Creator: Whatley, M. E.; Haas, P. A.; Horton, R. W.; Ryon, A. D.; Suddath, J. C. & Watson, C. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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SRL online Analytical Development

The Savannah River Site is operated by the Westinghouse Savannah River Co. for the Department of Energy to produce special nuclear materials for defense. R D support for site programs is provided by the Savannah River Laboratory, which I represent. The site is known primarily for its nuclear reactors, but actually three fourths of the efforts at the site are devoted to fuel/target fabrication, fuel/target reprocessing, and waste management. All of these operations rely heavily on chemical proce… more

Date: January 1, 1991

Creator: Jenkins, C.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Silver isotopic anomalies in iron meteorites: cosmic-ray production and other possible sources

The sources of excess /sup 107/Ag observed in iron meteorites by Kaiser, Kelly, and Wasserburg (1980) are examined, with emphasis on the reactions of cosmic-ray particles with palladium. The cross sections for the production of the silver isotopes from palladium by energetic cosmic-ray particles are evaluated or estimated and used to calculate spallogenic production rates relative to that of /sup 53/Mn from iron. The upper limit for the production rate of excess /sup 107/Ag by galactic-cosmic-r… more

Date: April 18, 1980

Creator: Reedy, R. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recovery of cesium, technetium, rhodium and palladium from stored waste supernates

The results of our assessment of the processing methods and costs for the recovery of cesium, techneium, rhodium, and palladium from aged waste supernates are presented. Guidelines for the assessment of costs are given. Cesium can be readily absorbed from alkaline waste supernates without prior treatment using Linde AW-500, a synthetic zolite. Technetium, present in the supernate as the pertechnetate anion, together with rhodium and palladium, probably present as anionic nitrite complexes, can … more

Date: June 22, 1966

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Atomic matching across internal interfaces

The atomic structure of internal interfaces in dense-packed systems has been investigated by high-resolution electron microscopy (HREM). Similarities between the atomic relaxations in heterophase interfaces and certain large-angle grain boundaries have been observed. In both types of interfaces localization of misfit leads to regions of good atomic matching within the interface separated by misfit dislocation-like defects. It appears that, whenever possible, the GB structures assume configurati… more

Date: January 1, 1989

Creator: Merkle, K.L. (Argonne National Lab., IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dislocation-hydrogen correlation in metals

We present a method using SANS experiments to measure correlation between dislocations and absorbed hydrogen in metals. The technique involves sequential measurements first on a metal with dislocation networks, then two further measurements on the same sample infused with deuterium and normal hydrogen. SANS experiments on metals with dislocations networks have been performed a number of times and some results have appeared in the literature. We have computer estimates of the contribution of abs… more

Date: November 1, 1987

Creator: Summerfield, G.C.; King, J.S.; Heuser, B.; Epperson, J.E. (Michigan Univ., Ann Arbor, MI (USA). Dept. of Nuclear Engineering & Argonne National Lab., IL (USA))

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A Modified Pyroelectric Sodium Fluoride Carrier Distillation Medthod For The Spectrographic Analysis Of Impurities In Plutonium

A modification of the pyroelectric sodium fluoride carrier distillation method for analysis of impurities in plutonium metal is described. The metal is dissolved. Plutonium is precipitated and treated with nitric acid. The slurry obtained is dried and ignited. The resultant low density oxide is mixed with sodium fluoride and pressed into a pellet for arcing. Cobalt is used as the internal standard for densitometric using visual comparisons against prepared standards. The procedural modification… more

Date: August 1, 1966

Creator: Schreiber, G. A. & Barrick, C. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tritium generation and neutron measurements in Pd-Si under high deuterium gas pressure

This paper summarizes some of the methods applicable for low level tritium detection needed in the search for anomalous fusion in metal hydrides. It is also intended to further detail our tritium and neutron results that have been obtained with the Pd-Si-D system, originally presented at earlier workshops. A measure of reproducibility that was not evident in our previous work has been achieved partially due to the better detection sensitivity afforded by the use of low tritium deuterium and par… more

Date: January 1, 1991

Creator: Claytor, T. N.; Tuggle, D. G. & Menlove, H. O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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HOMOGENEOUS REACTOR PROGRAM PROGRESS REPORT FOR PERIOD FROM DECEMBER 1, 1960 TO MAY 31, 1961

Homogoenous Reactor Test. Four HRT runs were performed to study the reactor behavior with downward core flow. The upper patch was found to have fallen out, resulting in an increase in core-to-blanket mixing. The reactor will not be operated again. In the HRT processing plant, the development of a process for removing Ni and other soluble contaminants from fuel solutions by peroxide precipitation was continued, and efficiency tests of stackfllter iodine traps were performed. Power-trace data and… more

Date: September 1, 1961

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thermal effects of electrically conductive deposits in melter

The radioactive waste processed by the Defense Waste Processing Facility melter at the Savannah river Site contains noble metal fission-products. Operation of waste-glass melters treating commercial power reactor wastes indicates that accumulation of noble metals on melter floors can lead to distortion of electric heating patterns, loss of power, and possible electrode damage. Changes in melter geometry have been developed in Japan and Germany to minimize these effects. The two existing melters… more

Date: January 1, 1992

Creator: Choi, I.G.; Bickford, D.F. & Carter, J.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Studies of heavy-ion reactions and transuranic nuclei

The development of the cold-fusion'' episode is reviewed. Ongoing studies of compound-nucleus formation and decay via the neutron multiplicity distribution confirm the validity of conventional statistical theory. The excitation energy partition in near-barrier damped {sup 58}Ni + {sup 208}Pb collisions is found to be largely independent of the direction of net mass transfer, supporting a diffusion-like nucleon-exchange mechanism. Exclusive experiments on the heavy reaction systems {sup 197}Au +… more

Date: August 1, 1991

Creator: Schroeder, W. U. & Huizenga, J. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Tritium and neutron measurements of a solid state cell

A solid state cold fusion'' cell was constructed to test for non-equilibrium fusion in a solid. The stimulus for the design was the hypothesis that the electrochemical surface layer in the Pons- Fleischmann cell could be replaced with a metal-insulator- semiconductor (MIS) barrier. Cells were constructed of alternating layers of palladium and silicon powders pressed into a ceramic form and exposed to deuterium gas at 110 psia resulting in a D/Pd ratio of 0.7. Pulses of current were passed throu… more

Date: January 1, 1989

Creator: Claytor, T. N.; Seeger, P. A.; Rohwer, R. K.; Tuggle, D. G. & Doty, W. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characterization of nanophase materials by x-ray diffraction and computer simulation

X-ray diffraction experiments on nanophase Pd have been performed with the primary goal of determining the nature of grain boundary structures in nanophase materials. A kinematical diffraction analysis has been developed to interpret x-ray {theta}--2{theta} data by comparing actual scans with scans produced by computer simulation. This simulation program has been used to explore the effects on diffracted intensity of a variety of microstructural and grain boundary structural parameters such as … more

Date: June 1, 1989

Creator: Eastman, J.A. & Thompson, L.J. (Argonne National Lab., IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Studies in Semiconducting Metal Oxides in Conjunction With Silicon for Solid State Gas Sensors. Progress Report for April 1, 1977--March 31, 1978

ZnO films have been reproducibly grown using chemical deposition and radio-frequency sputtering techniques. These films are polycrystalline or amorphous, but are stable, uniform and lend themselves to material characterization by Auger and x-ray analysis techniques, and electrical measurements. SnO/sub 2/ films have been reproducibly grown by chemical vapor deposition, vacuum deposition and radio-frequency sputtering techniques. These films are also polycrystalline or amorphous, and lend themse… more

Date: April 1, 1978

Creator: Jordan, A. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department