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The Effects of Irradiation on Some Binary Alloys of Thorium-Plutonium and Zirconium-Plutonium

Description: A specimen of cast thorium-5 wt% plutonium and one of thorium-10 wt% plutonium were irradiated to total atom burnups of 1.9 and 2.6%, respectively, at maximum fuel temperatures of approximately 450 deg C. Both alloys displayed excellent dimensional stability with volume increases of 0.8 and 1.2% per atom per cent burnup, respectively. Three cold-rolled specimens of zirconium-5 wt% plutonium and one cold-rolled specimen of zirconium-7 wt% plutonium were also irradiated. The zirconium- plutonium … more
Date: July 1, 1962
Creator: Horak, J. A.; Kittel, J. H. & Rhude, H. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Electrical Resistivity of Molten and Solid Thorium-Magnesium Eutetic

Description: Electrical resistivity properties of polycrystalline 39 wt % thorium-- magnesium eutectic are reported for the solid from room temperature to its melting point at 589 deg C and as a liquid from its melting point to 900 deg C. The electrical resistivity of the eutectic at the melting point was 69.5 microhm- centimeters; it decreased to a value of 64.8 microhm-centimeters at 900 C. Tantalum tubing was used to contain the alloy in the molten state. (auth)
Date: May 1, 1962
Creator: Provow, D. M. & Fisher, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development and characterization of an improved Ir--0. 3% W alloy for space radioisotopic heat sources

Description: An Ir--0.3% W alloy has been doped with minor alloying additions to develop an improved cladding material for space radioisotopic heat sources operating at temperatures to 1450/sup 0/C. Tensile tests of a series of doped alloys at slow strain rates indicated that the DOP-4 alloy containing 40 Al, 30 Th, 80 Fe, 10 Ni, and 75 Rh ppm was most resistant to the brittle fracture associated with grain-boundary separation. In addition, the DOP-4 dopants raise the recrystallization temperature, and reta… more
Date: October 1, 1977
Creator: Liu, C.T. & Inouye, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron scattering studies of heavy Fermions. [CeAl/sub 3/, UBe/sub 13/, CeCu/sub 2/Si/sub 2/, CeCu/sub 6/, ThBe/sub 13/, UPt/sub 3/, U/sub 2/Zn/sub 17/]

Description: Heavy Fermions are f electron materials characterized by a large linear term in the low temperature specific heat and a large magnetic susceptibility at low temperatures. This implies that there is a narrow peak in the f electron density of states at the Fermi energy. Typical examples are CeAl/sub 3/, UBe/sub 13/, CeCu/sub 2/Si/sub 2/, CeCu/sub 6/, U/sub 2/Zn/sub 17/ and UPt/sub 3/. Neutron scattering measurements can play an important role in understanding the magnetic interactions in these sy… more
Date: January 1, 1985
Creator: Shapiro, S.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic anisotropy in the U/sub x/Th/sub 1-x/Zn/sub 8. 5/ system

Description: We have investigated the source of the anisotropic susceptibility of UZn/sub 8.5/ by preparing single crystals of U/sub x/Th/sub 1-x/Zn/sub 8.5/ for small x. Preliminary indications are that anisotropic exchange, rather than crystal field effects, are responsible for the anisotropy, but possible impurity contributions to the (anisotropic) susceptibility of the ThZn/sub 8.5/ do not permit a stronger statement. Further measurements for small x show that both the electronic specific heat and the s… more
Date: January 1, 1986
Creator: Willis, J. O.; Fisk, Z.; Aikin, R. M.; McElfresh, M. W.; Thompson, J. D.; Zirngiebl, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hydrides and Metal-Hydrogen Systems. Final Report

Description: The work reported deals with the preparation and physical properties, especially thermal dissociation pressures, and densities of hydrides, hydrogen- metal systems, and mixtures of hydrides with other substances. Possible applicatlons as moderators, high-temperature neutron shields, and low-temperature shields are cited and design problems discussed. Most of the data on dissociation pressures cover ranges and compounds not hltherto explored because of experimental difficulties and the basic kno… more
Date: April 30, 1951
Creator: Gibb, T. R. P., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-power laser and arc welding of thorium-doped iridium alloys

Description: The arc and laser weldabilities of two Ir-0.3% W alloys containing 60 and 200 wt ppM Th have been investigated. The Ir-.03% W alloy containing 200 wt ppM Th is severely prone to hot cracking during gas tungsten-arc welding. Weld metal cracking results from the combined effects of heat-affected zone liquation cracking and solidification cracking. Scanning electron microscopic analysis of the fractured surface revealed patches of low-melting eutectic. The cracking is influenced to a great extent … more
Date: May 1, 1980
Creator: David, S.A. & Liu, C.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermophysical properties of thorium and uranium systems for use in reactor safety analysis

Description: The data compilation is intended to serve as a preliminary set of thermophysical property values for use in reactor safety analyses of the Th--/sup 233/U reactor concept. The properties covered include mp, bp, enthalpy, heats of vaporization and fusion, heat capacity, thermal conductivity, density, thermal expansion, emissivity, viscosity, etc. The systems covered are Th, Th/sub 0/./sub 9/U/sub 0/./sub 1/, U, ThO/sub 2/, Th/sub 0/./sub 9/U/sub 0/./sub 1/O/sub 2/, UO/sub 2/, U/sub 0/./sub 8/Pu/s… more
Date: June 1, 1977
Creator: Fink, J.K.; Chasanov, M.G. & Leibowitz, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Optimization of film synthesized rare earth transition metal permanent magnet systems

Description: This report reviews work on the optimization of film synthesized rare earth transition metal permanent magnet systems. Topics include: high coercivity in Sm-Fe-Ti-V, Sm-Fe-V, and two element systems; ThMn{sub 12} type pseudobinary SmFe{sub 12 {minus} X}T{sub X}; and sputter process control for the synthesis of precisely textured RE-TM magnetic films. (JL)
Date: January 1, 1990
Creator: Cadieu, F.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impurities in the heavy-Fermion superconductor UBe/sub 13/

Description: Small amounts of Sc, Lu, Gd, Np, Ce, Th, La, and Ba have been substituted for uranium in UBe/sub 13/ to observe their effects. The thorium, which was the most complete study, resulted in an extremely unusual nonmonotonic depression of the transition temperature for a nonmagnetic impurity. This comes from an interplay that exists between the lowest temperature resistivity peak and the transition temperature, as the peak is depressed. These results suggest tat heavy Fermion behavior is only a nec… more
Date: January 1, 1983
Creator: Smith, J.L.; Fisk, Z.; Willis, J.O.; Batlogg, B. & Ott, H.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nucleonics of a Be-Li-Th blanket for the fusion breeder

Description: The nuclear performance of a candidate fission-suppressed, U233-producing blanket is assessed. It is predicted to have a breeding ratio (fusile + fissile) of 1.68 and produce U233 at a rate of 8030 kg/year from 3140 MW of DT fusion and a blanket coverage of 96%. Blanket energy multiplication is estimated to vary between 1.3 and 2.0 as the U233/Th232 ratio varies between 0 and 0.5%. Heterogeneous effects in the blanket's pebble-bed configuration were found to be important and more detailed analy… more
Date: March 28, 1983
Creator: Lee, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental perspectives on heavy electron metals

Description: We motivate the description of heavy electron metals in terms of concepts from the Kondo problem. These concepts are used to discuss magnetism and superconductivity in heavy electron systems. Particular attention is given to what we view as the principal outstanding questions in this field and direction in which the field is developing. This will include consideration of the differences between Ce and U heavy electron compounds, as well as the occurrence of very small ordered magnetic moments. … more
Date: January 1, 1987
Creator: Fisk, Z.; Ott, H. R. & Aeppli, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experiments on Heavy Electron and High T/sub c/ Oxide Superconductors. [Gd-doped (U,Th)Be/sub 13/; RBa/sub 2/Cu/sub 3/O/sub 7/]

Description: In the first part of this paper, we briefly describe some of our efforts to determine the type of pairing and pairing mechanisms that are associated with the superconductivity of heavy electron materials by means of H/sub c2/(T) measurements in Gd-doped (U/sub 1-x/Th/sub x/)Be/sub 13/ alloys. An account of some of our recent work on the new high T/sub c/ copper oxide superconductors is given in the second part of the paper. 30 refs., 12 figs.
Date: January 1, 1987
Creator: Maple, M. B.; Dalichaouch, Y.; Ferreira, J. M.; Hake, R. R.; Lambert, S. E.; Lee, B. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Actinides and heavy fermions. [Th/sub x/U/sub 1-x/Be/sub 13/]

Description: The actinide series of elements begins with f-shell electrons forming energy bands, contributing to the bonding, and possessing no magnetic moments. At americium the series switches over to localized f electrons with magnetic moments. In metallic compounds this crossover of behavior can be modified and studied. In this continuum of behavior a few compounds on the very edge of localized f-electron behavior exhibit enormous electronic heat capacities at low temperatures. This is associated with a… more
Date: January 1, 1987
Creator: Smith, J.L.; Fisk, Z. & Ott, H.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Superconductivity in Filamentary Eutectic Composites. Progress Report, June 1, 1980-May 31, 1981

Description: The ac magnetic susceptibility of the Nb-Th eutectic composites in a dc magnetic field showed the existence of a mixed state in the thorium matrix material even in large fields of several kilogauss. This mixed state persisted until nearly the field at which superconductivity in the niobium filaments was destroyed. Measurements of the upper critical field H/sub c2 parallel/ were independent of filament diameter (from less than or equal to 100A to greater than or equal to 1000A) and showed less a… more
Date: 1981-22~
Creator: Zaitlin, Mark P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heavy electron superconductivity: From 1K to 90K to

Description: This paper reviews the experimental results and physical arguments which led us to conclude that in heavy electron systems the physical mechanism responsible for superconductivity is an attractive interaction between the heavy electrons which results from the virtual exchange of antiferromagnetic f-electron moment fluctuations. In these systems, then, the superconductivity is of purely electronic origin; the phonon-induced interaction between electrons which leads to superconductivity in ordina… more
Date: January 1, 1987
Creator: Pethick, C.J. & Pines, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron-beam welding of thorium-doped iridium alloy sheets. [Ir--0. 3% W 200 ppM Th-50 ppM Al]

Description: Modified iridium alloys containing 100 ppM Th were found to be very susceptible to hot-cracking during gas tungsten-arc and electron-beam welding. However, the electron-beam welding process showed greater promise of success in welding these alloys, in particular Ir--0.3% W doped with 200 ppM Th and 50 ppM Al. The weldability of this particular alloy was extremely sensitive to the welding parameters, such as beam focus condition and welding speed, and the resulting fusion zone structure. At low … more
Date: April 1, 1979
Creator: David, S.A.; Liu, C.T. & Hudson, J.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Superconductivity in filamentary eutectic composites. Progress report, June 1, 1978--May 31, 1979

Description: Progress made under DOE Contract No. ER-78-S-02-4938 has been in two areas. The design, construction, and testing of a helium temperature cryostat along with its associated electronics has been essentially completed, and measurements of the electrical resistivity of Nb--Th filamentary eutectic composites have been initiated.
Date: January 1, 1979
Creator: Zaitlin, M. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials compatibility considerations for a fusion-fission hybrid reactor design

Description: The Tandem Mirror Hybrid Reactor is a fusion reactor concept that incorporates a fission-suppressed breeding blanket for the production of /sup 233/U to be used in conventional fission power reactors. The present paper reports on compatibility considerations related to the blanket design. These considerations include solid-solid interactions and liquid metal corrosion. Potential problems are discussed relative to the reference blanket operating temperature (490/sup 0/C) and the recycling time o… more
Date: January 1, 1983
Creator: DeVan, J. H. & Tortorelli, P. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optimization of film synthesized rare earth transition metal permanent magnet systems. Progress report, August 1, 1989--July 1990

Description: This report reviews work on the optimization of film synthesized rare earth transition metal permanent magnet systems. Topics include: high coercivity in Sm-Fe-Ti-V, Sm-Fe-V, and two element systems; ThMn{sub 12} type pseudobinary SmFe{sub 12 {minus} X}T{sub X}; and sputter process control for the synthesis of precisely textured RE-TM magnetic films. (JL)
Date: December 31, 1990
Creator: Cadieu, F. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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