PROPERTIES OF HYDRIDED RE2Fe14B COMPOUNDS
Implications of the hydridation of the ternary borides RE2Fe14B on the physical, crystal structure and mechanical cohesion are discussed. Some examples are given, more particularly with RE = Y, Ce, Dy.
Materials Literature
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Surface and Gas Phase Production of HTO from HT: Review and Recommendations
The chemical processes by which tritium can be converted to tritiated water have been examined by reviewing the available literature on these processes. Gas phase conversion reactions at room temperature are slow and they do not contribute significantly to any observed conversion following releases of elemental tritiu…
Modeling and Experiments on Tritium Permeation in Fusion Reactor Blanketsa
Issues are discussed that are critical in determining tritium loss from helium-cooled fusion breeding blankets. These issues are: (a) applicability of present models to permeation at low tritium pressures, (b) effectiveness of oxide layers in reducing permeation, (c) effectiveness of hydrogen addition as a means to lo…
DIPOLAR MAGNETIC ANISOTROPY IN SOME UNIAXIAL HEXAGONAL FERRITES
Calculations for the magnetic dipolar contribution to the magnetic anisotropy of BaFe12O19 and LaFe11ZnO19 M-type and BaFe4Mn2O11 R-type hexagonal ferrites have been made. Our calculations take into account all the magnetic moments existing within a sphere with a radius of 118 Å, from which good convergence is reached…
Localization in the Peierls gap
The Peierls instability of a one-dimensional metal to a distortion of the lattice that opens a gap in the electronic spectrum at the Fermi energy, E F, has been extensively investigated in a wide range of low-dimensional conductors in the past decade. This field has provided a very rich range of new physics; these inc…
An XPS Study of the Effects of CF 4 Plasmas on Gold Surfaces
X-ray photoelectron spectroscopy has been employed to study the effect of CF 4 rf plasmas on gold surfaces. The data indicate that the CF 4 plasma converts the inert gold surface into a chemically active surface composed of gold, gold oxide, and gold fluoride. Upon exposure to air, the gold fluoride is hydrolyzed. The…
New data on glaucocerinite
Abstract The strongest lines in the X-ray powder diffraction pattern of type material of glaucocerinite from Laurion (Greece), indexed on a hexagonal pseudocell, are 10.9 (100) (003), 5.45 (90) (006), 3.63 (80) (009), 2.62 (60) (012), 2.46 (60) (015), 2.231 (50) (018), and 1.981 Å (50) (0.1.11). The pseudocell paramet…
Metallurgical Considerations on Pd, Pd-Alloy and Their Metal-Hydrogen Systems
This report is the content of a poster showing:- crystallographic analysis- phase diagrams in Pd-alloy/H2, D2 systems- diffusivity of 3He in Pd-alloy membrane- problems for tritium compatible design of Pd-diffuser- review of the past work done by authors
Interpenetrating bimodal networks
Abstract Sequential interpenetrating networks (IPN's) were obtained from a tetrafunctionally end‐linked network [prepared from hydroxyl‐terminated poly(dimethylsiloxane) (PDMS) chains having a number‐average molecular weight of 21.3 × 10 3 g mol −1 ] by swelling it with very short vinyl‐terminated PDMS chains (∼450 g…
K-Na exchange equilibria between muscovite-paragonite solid solution and hydrothermal chloride solutions
Abstract Three ion exchange equilibrium isotherms between muscovite-paragonite solid solution and 2-molal KCl-NaCl aqueous solutions have been studied at (1) 420°C 1 kbar, (2) 420°C, 2 kbar, and (3) 550°C, 2 kbar. The Δ G °(Joules) ± 2σ of the ion exchange reaction are: Δ G ° (1) = −17 259±686, Δ G ° (2) = −18 268 ± 5…
Immunochemical detection by specific antibody to thrombin of prothrombin conformational changes upon adsorption to artificial surfaces
Polyclonal antihuman alpha-thrombin antibodies produced in rabbits reacted minimally (less than 0.05%) in solution with human prothrombin. However, when prothrombin was adsorbed to artificial surfaces such as polyvinyl chloride (PVC), the cross-reactivity of surface-bound prothrombin with antibody IgG to thrombin (gre…
Effects of Boron and Zirconium on microstructure and magnetic properties of batch annealed Al-Killed low carbon steels
Crystallographic texture is one of the major factors affecting magnetic permeability of steels at flux densities\geq;1.5T. It is known that texture formation, and hence, permeability is significantly impacted by the precipitation of retained alumninum and nitrogen as AlN at sub-grains or cold-worked grain boundaries p…
7 Final Report on the Safety Assessment of Hydrolyzed Collagen
Hydrolyzed Collagen is a hydrolysate derived from animal byproducts. It is used in cosmetic products as a conditioner or moisturizer at concentrations less than 5 percent. Hydrolyzed Collagen was practically nontoxic when administered orally or dermally in acute animal toxicity studies. This ingredient was minimally i…
Recovery and Storage of Tritium by Zr-V-Fe Getter
The rates of ab/desorption of water vapor for Zr-V-Fe getter were investigated by means of mass analyzed thermal desorption spectroscopy. The absorption rate obeyed first order kinetics with respect to the pressure of water vapor. The activation energies for absorption were determined as 1.8 (H2O), 2.7 (D2O), and 3.2…
Carburization Mechanisms of High Chromium Alloys
Carburization is a major mode of corrosive degradation of high chromium alloy materials in many high temperature processes. The process generally involves the transfer of carbon from the gas phase onto the alloy surface followed by diffusion of carbon to the alloy interior with concurrent precipitation of chromium‐ric…
Tritium-Helium Effects in Metals
Investigations of helium effects in metals at the Savannah River Laboratory have been carried out by introducing helium by radioactive decay of tritium. This process does not create concurrent radiation damage, such as accompanies ion implantation and (n,α) reactions. The process has its own peculiarities, however, wh…
Fuel Fragmentation and Mechanical Energy Conversion Ratio at Rapid Deposition of High Energy in LWR Fuels
The fuel fragmentation is one of the important subjects in the field of molten fuel-coolant interaction (MFCI) since it is one of basic processes of the MFCI, and it has not yet been made clear enough. Accordingly, U02 fuel fragmentation was studied in a postulated reactivity initiated accident (RIA) condition by the…
Chemisorption and Catalysis in Polythionic/Thiosulfate Stress Corrosion Cracking
The stress corrosion cracking of sensitized stainless steels due to thiosulfate and tetrathionate has been associated with an increased rate of anodic dissolution in the active‐passive region of voltammetric scans, via the mutual sensitivity of both phenomena to a series of anionic inhibitors. The increased anodic dis…
Study of the Effect of Soft-Segment Length and Concentration on Properties of Polyetherurethanes. II. The Effect on Mechanical Properties
Abstract Three series of segmented polyurethanes with different soft segment lengths and concentrations were examined by TMA, DMA, and mechanical methods. Maximum tensile strengths were obtained when ssc was 40–50%, which was explained by a specific interlocking morphology. No significant effect of soft-segment chain…
DETERMINATION OF THE DEGREE OF CRYSTALLITES ORIENTATION IN PERMANENT MAGNETS BY X-RAY SCATTERING AND MAGNETIC MEASUREMENTS
Permanent magnet compounds are basically ferromagnets with uniaxial anisotropy. In different cases, the magnets are elaborated by sintering of powders previously oriented and compressed under field. The value of the remanent induction Br is directly dependent on the degree of crystallites alignment, and we present in…