A radioactivation method for the determination of oxygen in beryllium metal powder is described. The sample, mixed with, lithium fluoride, is irradiated in the Harwell Pile, fluorine-18 chemically separated and its activity compared with that from standards similarly treated. The method has given ...
A report is given on the determination of oxygen in uranium carbide by a new method of hot extraction in a stream of nitrogen replacing the molten bath of the vacuum fusion method. The nitrogen is not only used as a carrier gas but also as a chemical reactant, which — by the formation...
The resulting data are enough to suggest a new model of vacancies for the congruent lithium niobate based on the combination of both lithium and oxygen vacancies. 展开 关键词: metals nanostructures mechanical alloying scanning and transmission microscopy strain metal composite ...
Lithium (Li) metal is an ideal anode material for high energy density batteries. However, the low Coulombic efficiency (CE) and the formation of dendrites during repeated plating and stripping processes have hindered its applications in rechargeable Li metal batteries. The accurate measurement of Li...
Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy has been used to study the lattice site of impurities in lithium niobate single crystals. The determination of the distances from the impurity to the first oxygen coordination... C Zaldo,C Prieto - 《Ferroelectrics》 被引量: 10发表:...
Cation salt effects, 1000 ln Γ at 20°C, are (in per mil per mole per liter, using the convention of Horita et al. [Horita, J., Cole, D.R., Wesolowski, D.J., 1993a. The activity–composition relationship of oxygen and hydrogen isotopes in aqueous salt solutions: II. Vapor–...
Heating at 1000 °C in an oxygen atmosphere produces CO2, H2O, N2, nitrogen oxides, and sulfur oxides. The gaseous mixture then passes through the reduction furnace containing copper metal at 600 °C in a helium atmosphere, whereupon all nitrogen oxides are converted to N2 and sulfure oxides...
After CV reduction, the intensity of these peaks becomes much less, indicating that the amount of oxygen-containing groups at the surface of GO is greatly reduced. Moreover, N-H bendings at 1403–1458 cm−1 were designated to the hydrazo group in the structure of DPA, suggesting the ...
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The reversible binding of oxygen by hemoglobin requires red blood cells to maintain the heme iron in its reduced ferrous (Fe2+) state. As a transition metal, heme iron is readily oxidized to its ferric (Fe3+) form, forming methemoglobin, which does not bind oxygen. Methemoglobin is not on...