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in subjects: "Palladium Compounds"

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Catalyst and process development for the H/sub 2/ preparation from future fuel cell feedstocks. Quarterly progress report, October 1, 1978-December 31, 1978

The work done under this contract in the last quarter of 1978 was concerned with Phase I, which involved preliminary catalyst and process evaluation. The processes under study are hydrogen assisted steam reforming (HASR), catalytic partial oxidation (CPO), and autothermal steam reforming (ATR). Existing Engelhard test units were modified to carry out preliminary runs using the first two processes. Technical analysis to support work in this area consisted of heat and material balances constraine… more

Date: January 1, 1979

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

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Proton density modulation of D atoms in PdD/sub 1-x/

Recent resistivity and neutron diffraction measurements have provided evidence for ordering of D(H) atoms on the octahedral interstitial sites of PdD/sub 1-x/. This order--disorder transition is responsible for the 50 K anomaly which has been reported in many of the physical properties. Neutron diffraction measurements on a PdD/sub 0/ /sub 76/ single crystal revealed satellite reflection at (4/5,2/5,0) and equivalent positions. These satellites can be accounted for by a multi-domained tetragona… more

Date: January 1, 1979

Creator: Mueller, M.H.; Brun, T.O.; Hitterman, R.L.; Knott, H.W.; Satterthwaite, C.B. & Ellis, T.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Comparison of hydrogen diffusion in Ti sub 2 PdH sub x to the behavior for Ti sub 2 CuH sub x and Zr sub 2 PdH sub x

Nuclear magnetic resonance measurements of the proton spin-lattice and rotating-frame relaxation times were made on Ti{sub 2}PdH{sub x} over the temperature range 100K to 580K. Analyses of the NMR data for Ti{sub 2}PdH{sub x} gave hydrogen diffusion parameters that corresponded with the results previously obtained from Ti{sub 2}CuH{sub x} and Zr{sub 2}PdH{sub x} when the hydrogen atoms occupied a single type of tetrahedral interstital site. However, the diffusion activation energy decreases in … more

Date: January 1, 1990

Creator: Bowman, R.C. Jr. (Aerojet-General Corp., Azusa, CA (USA). Electronic Systems Div.); Attalla, A.; Abell, G.C. (EG and G Mound Applied Technologies, Miamisburg, OH (USA)); Cantrell, J.S. (Miami Univ., Oxford, OH (USA). Dept. of Chemistry) & Maeland, A.J. (Concrete Solutions, Meriden, CT (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Metallization of large silicon wafers. Final report

A metallization scheme has been developed which allows selective plating of silicon solar cell surfaces. The system is comprised of three layers. Palladium, through the formation of palladium silicide at 300/sup 0/C in nitrogen, makes ohmic contact to the silicon surface. Nickel, plated on top of the palladium silicide layer, forms a solderable interface. Lead-tin solder on the nickel provides conductivity and allows a convenient means for interconnection of cells. To apply this metallization, … more

Date: unknown

Creator: Pryor, R.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A new phase in palladium hydride technology

Two plateaux are observed in both the absorption and desorption isotherms of palladium hydride. For the absorption isotherm, a change in plateau pressure is observed at a hydrogen-to-metal (H/M) ratio of about 0.35 for all temperatures studied. For the desorption isotherm, the change in plateau pressure appears to be a function of temperature, ranging from an H/M ratio of 0.18 at 80{degrees}C to 0.3 at 140{degrees}C. These data are interpreted as being experimentally observed boundaries to an e… more

Date: January 1, 1991

Creator: Walters, R.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electrochemical and neutron diffraction measurements of PdD sub x cathodes

Potentiometric and in-situ neutron diffraction measurements have been carried out on PdD{sub x} cathodes in LiOD-saturated D{sub 2}O solution. Open-circuit potentials of the PdD{sub x} electrode after interruption of high-intensity cathodic currents (300--500 mA/cm{sup 2}) showed a more negative potential ({epsilon} = 1010 mV, measured against a Hg/HgO reference electrode) than that expected from the literature. The anomalous potentials were observed for about 10--20 min after current interrupt… more

Date: January 1, 1991

Creator: Redey, L.; Myles, K. M.; Rotella, F. J.; Richardson, J. W. Jr.; Felcher, G. P.; Hitterman, R. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Tritium labelled nucleotides: Heterogeneous metal catalyzed exchange labelling of ATP with tritium gas

Adenosine 5{prime} triphosphate (ATP) in aqueous solution has been labeled by exchange with tritium gas in the presence of palladium oxide catalyst. Comparison with our experiments using Pd/BaSO{sub 4} as the catalyst shows that we have obtained product with higher specific activity and improved chemical purity. {sup 3}H NMR spectroscopy of the tritiated ATP shows labelling in both the C-8 and C-2 positions, and the integral ratio of these positions was found to vary from 3:1 to 1:1 under diffe… more

Date: September 1, 1991

Creator: Jaiswal, D. K. (Defence Research and Development Establishment, Gwalior (India)); Morimoto, H.; Williams, P. G. & Wemmer, D. E. (Lawrence Berkeley Lab., CA (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Inelastic Neutron Scattering From Amorphous Hydride of Zr/sub 2/Pd

Time-of-flight inelastic neutron scattering data was obtained on hydrided Zr/sub 2/Pd metallic glass using the Crystal Analyzer Spectrometer at the Los Alamos pulsed spallation neutron source. Energy transfers from about 40 MeV to several hundred MeV were obtained with sufficiently good statistics and signal to noise ratio to show the second harmonic as well as the fundamental hydrogen optic mode.

Date: January 1, 1983

Creator: Williams, A.; Eckert, J.; Yeh, X. L.; Atzmon, M. & Samwer, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste. [Macrocyclic ligands covalently bonded to silica gel]

This report describes the testing of some novel separations materials known as SuperLig{trademark} materials for their ability to separate efficiently and selectively certain metal ions from a synthetic, nonradioactive nuclear waste solution. The materials, developed and patented by IBC Advanced Technologies, are highly selective macrocyclic ligands that have been covalently bonded to silica gel. The SuperLig{trademark} materials that were tested are: (1) SuperLig{trademark} 601 for barium (Ba{… more

Date: January 1, 1992

Creator: Camaioni, D.M.; Colton, N.G. (Pacific Northwest Lab., Richland, WA (United States)) & Bruening, R.L. (IBC Advanced Technologies, Inc., Provo, UT (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Aging effects in palladium and LaNi sub 4. 25 Al sub 0. 75 tritides

Palladium and LaNi{sub 5-x}Al{sub x} (x=0.30, 0.75, 0.85), which form reversible hydrides, are used for tritium processing and storage in the Savannah River Site (SRS) tritium facilities. As part of a program to develop technology based on the use of reversible metal hydrides for tritium processing and storage, the effects of aging on the thermodynamic behavior of palladium and LaNi{sub 4.25}Al{sub 0. 75} tritides are under investigation. During aging, the {sup 3}He tritium decay product remain… more

Date: January 1, 1991

Creator: Nobile, A.; Wermer, J.R. & Walters, R.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The synthesis and structural characterization of novel transition metal fluorides

High purity KMF[sub 6] and K[sub 2]MF[sub 6] salts (M = Mo,Re, Ru, Os, Ir, Pt) are obtained from reduction hexafluorides. A rhombohedral unit cell is observed for KReF[sub 6]. Fluoride ion capture by Lewis acids from the hexafluorometallate (IV) salts affords high purity tetrafluorides for M = Mo, Re, Ru, Os, and Pd. The structure of RuF[sub 4] is determined from X-ray synchrotron and neutron powder data. Unit cells based on theorthorhombic PdF[sub 4] type cell are derived from X-ray powder dat… more

Date: September 1, 1992

Creator: Casteel, W.J. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A study of Pd-Ta on Si(100) using AES, RBS and variable energy positron annihilation

The applicability of Pd/sub x/Ta/sub 1-x/ as a diffusion barrier on Si has been investigated. For this purpose Pd/sub x/Ta/sub 1-x/ films of 200 nm thickness (x ranges from 0 to 1) were deposited on Si(100), and the reaction between over-layer and substrate was studied as a function of temperature. Interaction was found to occur at temperatures increasing with the Ta content. The as-deposited Pd/sub x/Ta/sub 1-x/ films with 0.2 less than or equal to x less than or equal to 0.6 were found to be … more

Date: January 1, 1988

Creator: Van Der Kolk, G. J.; Kuiper, A. E. T.; Duchateau, J. P. W. B.; Willemsen, M.; Nielsen, B. & Lynn, K. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Raman studies of hydrogen vibrational modes in palladium

The phonon density of states of substoichiometric polycrystalline Pd-H(D) was investigated by Raman scattering above and below the 50 K anomaly. The Raman spectra for hydrogen and deuterium were found to be asymmetric and peaked at 58.5 MeV and 39.7 MeV, respectively, in near agreement with inelastic neutron scattering data. The scattering mechanism appears to require hydrogen-hydrogen interactions. No major changes in the optical spectra were observed in going through the 50 K anomaly.

Date: January 1, 1978

Creator: Sherman, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Modeling of temporal behavior of isotopic exchange between gaseous hydrogen and palladium hydride power

A parametric rate-equation model is described which depicts the time dependent behavior of the isotopic exchange process occurring between the solid and gas phases in gaseous hydrogen (deuterium) flows through packed-powder palladium deuteride (hydride) beds. The exchange mechanism is assumed to be rate-limited by processes taking place on the surface of the powder. The fundamental kinetic parameter of the model is the isotopic exchange probability, p, which is the probability that an isotopic … more

Date: January 1, 1987

Creator: Melius, C F & Foltz, G W

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Antiferromagnetism and enhanced heat in CeM sub 2 Sn sub 2 (M = Ni, Ir, Cu, Rh, Pd, and Pt)

Recently a new series of compounds has been discovered by M. Selsane et al. which has a structure close to CeCu{sub 2}Si{sub 2}. Specific heat, dc susceptibility, and resistivity measurements on annealed, polycrystalline samples of CeM{sub 2} Sn{sub 2} where M = Ni, Ir, Cu, Rh, Pd, or Pt indicate that each of these compounds orders antiferromagnetically with transition temperatures ranging from T{sub N} = 4.1 K to {approx} 0.5 K. All these materials have significant enhancements of the specific… more

Date: January 1, 1990

Creator: Beyermann, W.P.; Hundley, M.F.; Canfield, P.C.; Fisk, Z.; Smith, J.L.; Thompson, J.D. (Los Alamos National Lab., NM (USA)) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Metallization of large silicon wafers. Quarterly technical report No. 1, August 26--December 31, 1977. [45 references]

A proposed metallization system for large area silicon solar cells with shallow junctions is outlined, and its desirable features are discussed. A baseline process sequence for the nickel palladium metallization system (NPMS) is delineated. This baseline process sequence is serving as the starting point from which process variations are being performed. The eventual goal is optimization of the NPMS process and determination of the control ranges for NPMS process variables. Initial studies of pa… more

Date: January 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Resonance Raman spectra of metal halide vapor complexes

Resonance Raman spectra of complex vapor phase compounds formed by reacting ''acidic'' gases (A/sub 2/X/sub 6/ = Al/sub 2/Cl/sub 6/, Al/sub 2/Br/sub 6/, In/sub 2/Cl/sub 6/) with metal halides have been measured. Spectra obtained from equilibrium vapor mixtures of A/sub 2/X/sub 6/ over solid MX/sub 2/ (= PdCl/sub 2/, PdBr/sub 2/, CuCl/sub 2/, CoBr/sub 2/, TiCl/sub 2/, FeCl/sub 2/, NiCl/sub 2/, PtCl/sub 2/) were a superposition of the A/sub 2/X/sub 6/-AX/sub 3/ bands and in few cases of new reson… more

Date: January 1, 1978

Creator: Paptheodorou, G.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Muon spin relaxation studies of heavy fermion superconductors

This talk will focus recent developments in our understanding of heavy fermion (HF) superconductors and the role that positive muon spin relaxation ([mu]SR) studies have played in helping to elucidate their properties. As illustrations two systems will be discussed: (1) UPd[sub 2]Al[sub 3], one of the most recently discovered HF superconductors, which also displays coexisting magnetic order and (2) UBe[sub 3] doped with small quantities Of Th substituted for U, which displays an interplay betwe… more

Date: January 1, 1993

Creator: Heffner, R.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Molecular modeling of metal hydrides: 2. Calculation of lattice defect structures and energies utilizing the Embedded Atom Method

Lattice defect structures and energies for palladium, nickel and aluminum computed include: single vacancy, self-interstitial, intrinsic stacking fault, coherent twin boundary and (100), (110), and (111) free surfaces. The importance of considering lattice defects in obtaining an accurate Embedded Atom Method (EAM) description of real materials, and the application of the EAM to the computation of lattice defect structures for palladium, nickel and aluminium is discussed. The EAM functions deve… more

Date: December 1, 1990

Creator: Wolf, R.J. & Mansour, K.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Oxidizing behavior of some platinum metal fluorides. [Xe complexes with Pt, Pd fluorides; Chlorine-2 oxidation by transition metal hexafluorides]

The previously known compounds Xe/sub 2/F/sub 3//sup +/PtF/sub 6//sup -/, XeF/sup +/PtF/sub 6//sup -/ and XeF/sub 2/.2PtF/sub 4/(XePt/sub 2/F/sub 10/) were prepared by the interaction of XeF/sub 2/ with PtF/sub 4/. The new compounds XeF/sub 2/.PdF/sub 4/ and XeF/sub 2/.2PdF/sub 4/(XePd/sub 2/F/sub 10/) were produced by interaction of XeF/sub 2/ with either PdF/sub 4/ or Pd/sub 2/F/sub 6/. A weight loss-versus-time curve indicated the presence of 4:1, 3:1 and 2:1 XeF/sub 2//PdF/sub 4/ complexes.… more

Date: October 1, 1978

Creator: Graham, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Rietveld refinement of magnetic structures from pulsed-neutron-source powder-diffraction data

The General Structure Analysis System, GSAS, has recently been modified to include magnetic neutron-scattering cross-sections. Low-temperature diffraction data have been taken on the hexagonal noncollinear antiferromagnet UPdSn on both the HIPD and the NPD powder diffractometers at LANSCE. The low-resolution data reveal that the magnetic structure has orthorhombic symmetry (magnetic space group P[sub c]112[sub 1]) between 25K and 40K, and monoclinic symmetry (magnetic space group P[sub c]l12[su… more

Date: January 1, 1993

Creator: Robinson, R. A.; Lawson, A. C.; Larson, A. C.; Von Dreele, R. B. & Goldstone, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste

Date: January 1, 1992

Creator: Camaioni, D. M.; Colton, N. G. & Bruening, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Rietveld refinement of magnetic structures from pulsed-neutron-source powder-diffraction data

The General Structure Analysis System, GSAS, has recently been modified to include magnetic neutron-scattering cross-sections. Low-temperature diffraction data have been taken on the hexagonal noncollinear antiferromagnet UPdSn on both the HIPD and the NPD powder diffractometers at LANSCE. The low-resolution data reveal that the magnetic structure has orthorhombic symmetry (magnetic space group P{sub c}112{sub 1}) between 25K and 40K, and monoclinic symmetry (magnetic space group P{sub c}l12{su… more

Date: May 1, 1993

Creator: Robinson, R. A.; Lawson, A. C.; Larson, A. C.; Von Dreele, R. B. & Goldstone, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Qualification of reserve RTF Pd/Z: Task technical plan

Palladium deposited on zeolite (Pd/Z) used in the Purge Stripper System in the Replacement Tritium Facility (RTF) was produced using tetraamminepalladium (II) nitrate and 4{times}8 mesh beads of Type 4A zeolite. In March 1991, RTF requested that an additional 100 liters of Pd/Z be procured as reserve material, half by ETS and half from Ionex Research Corp. Objective of this activity is to confirm that Reserve RTF Pd/Z meets the technical requirements of the Specification WCM-4 for procurement o… more

Date: June 16, 1994

Creator: Mosley, W. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department