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A toxicological study of gadolinium nitrate

Description: The sensitization study in the guinea pig did not show gadolinium nitrate to have potential sensitizing properties. Skin application studies in the rabbit demonstrated that it was cutaneously a severe irritant. This material was considered an irritant in the rabbit eye application studies. 3 refs., 1 tab.
Date: May 1, 1988
Creator: London, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preparation of oxide superconductors

Description: Preparation of bulk superconductors by cold pressing and sintering of metal oxides has been optimized in this study. A knowledge of phase behavior was used in developing a flux method for growing superconducting single crystals of yttrium and gadolinium based superconductors. Means of achieving single-phase, high-density samples of (Rare Earth)-Ba/sub 2/Cu/sub 3/O/sub 7/ with optimal electronic properties are reviewed. 2 refs., 2 figs.
Date: January 1, 1988
Creator: Peterson, D.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation damage studies related to nuclear waste forms

Description: Much of the previously reported work on alpha radiation effects on crystalline phases of importance to nuclear waste forms has been derived from radiation effects studies of composite waste forms. In the present work, two single-phase crystalline materials, Gd/sub 2/Ti/sub 2/O/sub 7/ (pyrochlore) and CaZrTi/sub 2/O/sub 7/ (zirconolite), of relative importance to current waste forms were studied independently by doping with /sup 244/Cm at the 3 wt % level. Changes in the crystalline structure me… more
Date: December 1, 1981
Creator: Gray, W.J.; Wald, J.W. & Turcotte, R.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fuel performance annual report for 1983. Volume 1

Description: This annual report, the sixth in a series, provides a brief description of fuel performance during 1983 in commercial nuclear power plants. Brief summaries of fuel design changes, fuel surveillance programs, fuel operating experience, fuel problems, high-burnup fuel experience, and items of general significance are provided. References to additional, more detailed information and related NRC evaluations are included.
Date: March 1, 1985
Creator: Bailey, W.J. & Dunenfeld, M.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Program of thermoelectric generator testing and RTG degradation mechanisms evaluation. Progress report No. 38

Description: The n-type gadolinium selenide legs after 17,500 hours continue to show reasonable agreement with the 3M Co. published thermal conductivity data. Weight loss for both coated and uncoated Si-Ge material produced by G.E. are reported. No significant discrepancies with the results previously obtained on R.C.A. material from the MHW program have been found. Thermal conductivity measurements are also in agreement. The remaining MHW generator on test, Q1-A, has accumulated 26,800 hours and performanc… more
Date: November 1, 1980
Creator: Lockwood, A. & Shields, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Crystal Field Interaction and Magnetic Order in GdBa/sub 2/Cu/sub 3/O/sub 7/

Description: We report experimental data on the crystal field interaction of Gd ions with their environment in Gd/sub x/Eu/1-x/Ba/sub 2/Cu/sub 3/O/sub 7/. The ESR spectrum and a Schotiky anomaly in the specific heat of dilute samples indicate the existence of a crystal field splitting of the /sup 8/S/sub 7/2/ ground state of the Gd/sup 3 +/ ions of about 1.5K. Since the single ion energies involved are of the same order of magnitude as the energies associated with the magnetic ordering of the Gd moments in … more
Date: January 1, 1988
Creator: Causa, M. T.; Fainstein, C.; Nieva, G.; Sanchez, R.; Steren, L. B.; Tovar, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fabrication of selenide segmented elements

Description: Processes are described for the fabrication of P- and N-type elements with high-efficiency selenide segments. Bonded hot and cold caps were attached to these elements with techniques based on processes developed in successful TRANSIT and Ring converter programs. An iron barrier was introduced in the segmented P-type element between the (Cu,Ag)/sub 2/Se and (Bi,Sb)/sub 2/Te/sub 3/ layers. This was made necessary by the known degradation in thermoelectric properties of (Bi,Sb)/sub 2/Te/sub 3/ con… more
Date: March 1, 1980
Creator: Elsner, N.B.; Chin, J. & Reynolds, G.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Correlation of waterside corrosion and cladding microstructure in high-burnup fuel and gadolinia rods

Description: Waterside corrosion of the Zircaloy cladding has been examined in high-burnup fuel rods from several BWRs and PWRs, as well as in 3 wt % gadolinia burnable poison rods obtained from a BWR. The corrosion behavior of the high-burnup rods was then correlated with results from a microstructural characterization of the cladding by optical, scanning-electron, and transmission-electron microscopy (OM, SEM, and TEM). OM and SEM examination of the BWR fuel cladding showed both uniform and nodular oxide … more
Date: September 1, 1989
Creator: Chung, H.M. (Argonne National Lab., IL (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Physical characteristics of GE (General Electric) BWR (boiling-water reactor) fuel assemblies

Description: The physical characteristics of fuel assemblies manufactured by the General Electric Company for boiling-water reactors are classified and described. The classification into assembly types is based on the GE reactor product line, the Characteristics Data Base (CDB) assembly class, and the GE fuel design. Thirty production assembly types are identified. Detailed physical data are presented for each assembly type in an appendix. Descriptions of special (nonstandard) fuels are also reported. 52 re… more
Date: June 1, 1989
Creator: Moore, R.S. & Notz, K.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermoelectric generator testing and RTG degradation mechanisms evaluation. Progress report No. 35

Description: The n-type selenide legs after 14,000 hours continue to show reasonable agreement with the 3M Co. published data. In the ingradient testing after 14,700 hours the n-legs show serious degradation in power to load. Weight loss measurements on the first samples of material produced by G.E. match the results previously obtained on R.C.A. material from the MHW program. The remaining MHW generator on test Q1-A has accumulated 22,519 hours and performance remains stable. The 18 couple modules S/N-1 an… more
Date: May 1, 1980
Creator: Lockwood, A. & Shields, V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ordered structures in YBa/sub 2/Cu/sub 3/O/sub 7-y/, La/sub 2-x/Sr/sub x/CuO/sub 4-par. delta/ and related perovskites

Description: Electron microscopy and electron diffraction studies have been performed on the superconducting oxides YBa/sub 2/Cu/sub 3/O/sub 7-y/, GdBa/sub 2/Cu/sub 3/O/sub 7-y/ and La/sub 2-x/Sr/sub x/CuO/sub 4-par. delta/ as well as the related perovskites La/sub 2/CuO/sub 4/, Eu/sub 2/CuO/sub 4/ and Gd/sub 2/CuO/sub 4/. Extra reflections are commonly observed in all the cases. For example, in the 123 compounds, in situ heating leads to transformations from orthorhombic to tetragonal with a loss of twin s… more
Date: January 1, 1988
Creator: Mitchell, T.E.; Roy, T.; Fisk, Z. & Smith, J.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation induced amorphization in YBa2Cu3O7 and GdBa2Cu3O7 superconductors

Description: The response of YBa2Cu3O7 and GdBa2Cu3O7 high temperature superconductors to particle irradiation is examined. Both ion and electron irradiations have been shown to first produce an orthorhombic-to-tetragonal transformation at doses roughly a factor of 10 higher. Analysis of the displacement stoichiometry that results from 120, 300, and 1000 keV electron irradiations, 400 and 500 keV O irradiations, and 300 keV helium irradiations indicate that the orthorhombic-to-tetragonal transformation is d… more
Date: January 1, 1988
Creator: Parkin, Don M. & Nastasi, Michael
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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/sup 11/B study of spin dynamics in Y/sub 1-x/RE/sub x/Rh/sub 4/B/sub 4/. [RE = Gd, Er]

Description: There has been intense interest in re-entrance and coexistence in ternary rare earth magnetic superconductors of the form RE Rh/sub 4/B/sub 4/. Of particular interest in this investigation is the effect of the superconducting state on the RKKY (Yosida, 1957) coupling between RE ions. Since one expects the conduction electron spin susceptibility chi/sup e/(q) to be cut off for q < 1/xi in the superconducting state, a depression f the RKKY coupling should follow. Such an effect would both depress… more
Date: June 1, 1982
Creator: Kumagai, K. & Fradin, F.Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preparation and some properties of H/sub x/REBa/sub 2/Cu/sub 3/O/sub 7/ (RE = Er, Nd, Dy, Ho, Gd) superconductors

Description: Hydrogen gas has been found to react directly with the subject oxides. Most exhibit a small region of H solid solubility which remains superconducting with a slight increase in critical temperature (1 to 2K). At higher H contents a hydrogen rich hydride phase precipitates which is amorphous. The H rich phases are not superconducting at 4K or above. Neutron diffraction studies of D/sub 1.55/YBa/sub 2/Cu/sub 3/O/sub 7/ confirm that the D rich phase is amorphous but that its precipitation causes i… more
Date: January 1, 1988
Creator: Johnson, J.; Suenaga, M.; Thompson, P. & Reilly, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Immobilization of sodium and phosphorus-bearing PW-7a waste in SYNROC. Progress report. [SYNROC C]

Description: The phosphorus, sodium and gadolinium-rich PW-7a waste can be successfully incorporated in SYNROC-C. However, a new accessory phase, a Ca,Na,Ba phosphate isostructural with Ca/sub 5/Na/sub 2/(PO/sub 4/)/sub 4/ apppears in the SYNROC mineralogy. There is no evidence for the partition of key radionuclides (e.g. Sr, REE and hence actinides) into this phosphate. Its poor resistance to groundwater dissolution, whilst hardly desirable, may therefore not have a serious effect on the leaching performan… more
Date: August 9, 1982
Creator: Ringwood, A.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Muon spin depolarization in Gd- and EuBa/sub 1/Cu/sub 3/O/sub x/

Description: Positive muon spin rotation (..mu..SR) measurements on Gd- and EuBa/sub 2/Cu/sub 3/O/sub x/ (x approx. 7) have been conducted in the temperature interval 4-300K. For each sample, muons stop both at grain boundaries and within the superconducting grains. Measured magnetic field penetration depths are 1550 and 1900/angstrom/ for two specimens of GdBa/sub 2/Cu/sub 3/O/sub x/, and 1350/angstrom/ for EuBa/sub 2/Cu/sub 3/O/sub x/. 2 refs., 5 figs.
Date: January 1, 1988
Creator: Cooke, D. W.; Hutson, R. L.; Kwok, R. S.; Maez, M.; Rempp, H.; Schillaci, M. E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radioisotope space power generator. Annual report, October 1978-September 1979

Description: The emphasis of the Isotec Technology Program shifted from development of a Galileo generator to study of a segmented selenide element and couple technology. The goal of the FY 79 program was to determine the feasibility of fabricating segmented selenide P and N elements which exploit the high thermoelectric efficiency of (Cu,Ag)/sub 2/Se and Gd/sub 2/Se/sub 3/ materials. A preliminary evaluation of segmented element efficiencies, material compatibilities, and fabrication abilities was used to … more
Date: March 1, 1982
Creator: Elsner, N. B.; Chin, J.; Staley, H. G.; Bass, J. C.; Morris, C. C.; Shearer, C. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental magnetic studies of iron-rare-earth-metalloid alloys

Description: This research is focused on the synthesis of new iron-rare-earth magnetic phases which may have significant technological properties. An important aim is to investigate new methods for producing these materials such as melt spinning and sputtering plus specific heat treatments. Studies are made of the relationship between microstructure and properties such as coercivity, spontaneous magnetization, and anisotropy (magnitude and direction) in bulk and thin film samples. Our goal is to understand … more
Date: January 1, 1989
Creator: Sellmyer, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energy transfer and non-linear optical properties at near ultraviolet wavelengths: Rare earth 4f yields 5d transitions in crystals and glasses

Description: The following topics were studied: two-photon transitions from 4f ground state to 5d excited states in Ce{sup 3+}:CaF{sub 2}; optical absorption and photoionization measurements from excited state of Ce{sup 3+}:Y{sub 3}Al{sub 5}O{sub 12}; excited state photoionization of Ce{sup 3+} ions in Ce{sub 3+}:CaF{sub 2}; optical gain and loss studies in Ce{sup 3+}:LiYF{sub 4}; Gd {yields}Cr energy transfer in Cr{sup 3+}:GSGG, Cr{sup 3+}:GSAG and Cr{sup 3+}:GGG crystals; nonradiative relaxation in Ce{sup… more
Date: June 1, 1984
Creator: Hamilton, D. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved method for preparing rare earth sesquichalcogenides

Description: An improved method for the preparation of high purity rare earth sesquichalcogenides is described. The rare earth, as one or more pieces of the metal, is sealed under a vacuum with a stoichiometric amount of sulfur or selenium and a small amount of iodine into a quartz reaction vessel. The sealed vessel is then heated to above the vaporization temperature of the chalcogen and below the melting temperature of the rare earth metal and maintained until the product has been formed. The iodine is th… more
Date: April 14, 1982
Creator: Takeshita, Takuo; Beaudry, Bernard J. & Gschneidner, Karl A., Jr.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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Studies of selected transuranium and lanthanide triiodides under pressure using absorption spectrophotometry

Description: The anhydrous triiodides of plutonium, americium, and curium under pressure have been investigated using absorption spectrophotometry. These initial studies on plutonium and curium triiodides together with the published data for americium triiodide show that the rhombohedral (BiI/sub 3/-type structure) form of these compounds can be converted to the same orthorhombic (PuBr/sub 3/-type structure) form by applying pressure at room temperature. Absorption spectrophotometry can often differentiate … more
Date: January 1, 1986
Creator: Haire, R. G.; Young, J. P.; Peterson, J. R. & Benedict, U.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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