نتایج جستجو برای: niobium
تعداد نتایج: 3152 فیلتر نتایج به سال:
Nanocrystalline niobium carbide (NbC) ceramics and carbide-niobium nitride (NbC/NbN) composites were synthesized at low temperatures without high-pressure sintering using a single-step polymer-derived approach from meltable pre-ceramic blend. Niobium hydride (NbH5) 1,2,4,5-tetrakis(phenylethynyl)benzene (TPEB) reacted 1500 °C under argon or nitrogen in tube furnace to form NbC NbC/NbN with high...
Abstract: mechanical properties of AISIH 13 hot-work tool steel have been studied. Cast samples made of the modified new steel were homogenized and austenitized at different conditions, followed by tempering at the specified temperature ranges. Hardness, red hardness, three point bending test and Charpy impact test were carried out to evaluate the mechanical properties together with characteriz...
We report electrical measurements of ' a sandwich structure consisting of a niobium electrode in contact with a thin lightly doped n type InGaAs layer. The bottom of the sandwich is a degenerate layer of n-type InGaAs used to collect the current. The semiconductor layers are grown by molecular beam epitaxy (MBB). These three layers are the essence of the proposed superconducting-base, semicondu...
The processes of creating a superconducting niobium coating on cryogyroscope rotor were considered. conditions for the electrodeposition coatings from molten salt rotors cryogenic gyroscope determined. Niobium obtained electrochemically polished and subsequently protective pentoxide was electroformed. occurring during electrodeposition, electropolishing electrooxidation equipment technology dev...
In this study, different samples of Niobium and Vanadium co-doped titania thin films (5-10-15 mol% Nb and 5-10-15 mol% V) were prepared via sol−gel dip coating method, using niobium chloride as niobium precursor, ammonium metavanadate as vanadium precursor, and titanium (IV) butoxide (TBT) as titanium precursor. The effects of doping amount on the structural, optical, and photo-catalytic prope...
An empirical correlation is established for relating Raman stretching frequencies of niobium-oxygen (Nb-O) bonds to their respective bond distances in niobium oxide compounds. The correlation is an exponential least-squares fit between measured Raman frequencies and reported crystallographic bond lengths. Niobium-oxygen bond strengths (in valence units) are also related to Raman stretching freq...
Atomic-scale characterization of hydrogen and formation of niobium hydrides, using ultraviolet (wavelength=355 nm) picosecond laser-assisted local-electrode atom-probe tomography, was performed for ultrahigh purity niobium utilizing different laser pulse energies, 10 or 50 pJ/pulse or voltage pulsing. At 50 pJ/pulse, hydrogen atoms migrate onto the 110 and 111 poles as a result of stimulated su...
Illumination of diamond with above-bandgap light results in emission of electrons into water and formation of solvated electrons. Here we characterize the materials factors that affect that dynamics of the solvated electrons produced by illumination of niobium substrates and of diamond thin films grown on niobium substrates using transient absorption spectroscopy, and we relate the solvated ele...
The decay of (19)O(β(-)) and (19)Ne(β(+)) implanted in niobium in its superconducting and metallic phases was measured using purified radioactive beams produced by the SPIRAL GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within a 1σ error bar. This measurement casts strong doubts on the predicted strong electron screening in a superconductor, the so-c...
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