Results 341 to 350 of about 365,546 (366)

ChemInform Abstract: Dithiocarbamates of Tungsten(III) and Tungsten(IV).

ChemInform, 1987
AbstractThe dimeric tris(dialkyldithiocarbamato)‐W(III) complexes (III) and the monomeric tetrakis(dialkyldithiocarbamato)‐W(IV) complexes (IV) are prepared by photochemical oxidative decarbonylation of the starting complex (I) as shown.
W. Earle Waghorne, David Brown, Hani J. Toma, William K. Glass   +3 more
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Conversion of tungsten nitride to pure tungsten

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1998
The properties of W2N thin films deposited on Si, SiO2, and Ta2O5 by plasma-enhanced chemical vapor deposition, with and without an electron cyclotron resonance plasma formed SiO2 (ECR-SiO2) top layer are comparatively investigated. The ECR-SiO2 top layer can effectively promote the conversion of W2N to pure W while samples are annealed at high ...
Atsuhiro Tsukune, Jun Lin, Toshiya Suzuki, Masao Yamada   +3 more
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Production of Tungsten and Tungsten Carbide Powders

Powder Metallurgy and Metal Ceramics, 2019
A method has been developed to process waste of tungsten–cobalt solid solutions by potentiostatic dissolution in phosphoric acid solutions. A dissolution mechanism depending on the electrode potential has been proposed. A technique for extracting tungsten from tungsten concentrates in chloride–metasilicate melts has been developed.
Viktor Malyshev, Viktor Malyshev, N. F. Kushchevska   +2 more
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Chromium, molybdenum and tungsten [PDF]

Annual Reports Section "A" (Inorganic Chemistry), 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Mobility of tungsten clusters on tungsten surfaces

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2019
Abstract We report on an accelerated molecular dynamics investigation of surface transport mechanisms on W surfaces. These mechanisms likely influence the formation of nano-fuzz in fusion plasma-facing conditions. The simulations use an embedded-atom potential to investigate the diffusion mechanisms of W clusters (Wn, n = 2–9) on W(1 1 0) and W(1 0 0)
Danny Perez, Li Yang, Brian D. Wirth, Brian D. Wirth, Arthur F. Voter   +4 more
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Tungsten Oxide Nanowires on Tungsten Substrates

Nano Letters, 2002
A simple method was discovered to prepare tungsten oxide nanowires directly from tungsten metal. The structure and composition of the nanowires were characterized by high resolution tunneling electron microscopy (HRTEM) and energy dispersive X-ray scattering (EDX), respectively.
Wei-Qiang Han, Gang Gu, Bo Zheng, Siegmar Roth, Jie Liu   +4 more
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Reduction of tungsten oxide to tungsten metal

Metallurgical Transactions B, 1976
Tungsten oxide, WO2.96, was reduced toα-W in hydrogen for various time periods over the temperature range 500°C to 900°C. Intermediate oxides were determined using X-ray diffraction analysis of the semireduced powders. Several dopant conditions were used, to find the effect on oxide structures and reaction kinetics of the usual dopants K, Si and Al ...
Theodore R. Wilken, John B. Woodhouse, Charles Wert, William R. Morcom   +3 more
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Relaxation of tungsten adatoms on tungsten surfaces

Physics Letters A, 1974
Abstract The relaxation energy of a tungsten atom on tungsten surfaces is estimated to be about 1 eV. It seems difficult to neglect the variation of that energy in the interaction between adatoms.
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Fabrication of Tungsten and Tungsten-25%-Rhenium Tubing

Nuclear Applications, 1965
Techniques were developed for the fabrication of seamless tungsten and tungsten-25%rhenium tubing. Appropriate procedures were established for primary extrusion, re-extrusion, and warm drawing.
S. Isserow, J.G. Hunt, G.I. Friedman, R. G. Jenkins   +3 more
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Diffusion of tungsten on stepped tungsten surfaces

Surface Science, 1990
Abstract Self-diffusion of thermally generated tungsten atoms near (123) and (257), on the zone (011)–(112) and on (023), on the zone (011)–(001) of a tungsten field emitter has been investigated by the field-emission fluctuation method, using a rectangular probe in order to investigate diffusion anisotropy. In agreement with earlier findings of Gong
Seong Keun Kim, Robert Gomer, D.-S. Choi
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