Topic
Tungsten
About: Tungsten is a research topic. Over the lifetime, 35225 publications have been published within this topic receiving 456213 citations. The topic is also known as: W & element 74.
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TL;DR: In this paper, a deuterium plasma beam with high flux and low energy was used to expose polycrystalline tungsten to fluences up to 1027 Dm−2.
Abstract: Recrystallized polycrystalline tungsten was exposed to a deuterium plasma beam with high flux (1022 D m−2 s−1) and low energy (38 eV D−1) to fluences up to 1027 D m−2 The sample temperature was varied between 320 and 800 K The three-dimensional morphology of blister-like structures and the grain orientation were investigated by scanning electron microscopy combined with focused ion beam cross-sectioning and electron backscattering diffraction Cracks with distorted areas ( 480 K) were observed beneath the surface The surface blister-like structures and the defects underneath are correlated along crystallographic orientation of the W grains in accordance to the low-indexed slip system {110}111 The defects are mobile and accumulate under deuterium loading Samples exposed near room temperature do not form such large cavities by subsequent heating up to 1300 K Deuterium bombardment above 700 K does not lead to blister-like structures
113 citations
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TL;DR: Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy as mentioned in this paper, and the signature of prompt redeposition was observed in the analysis of WI 400.
113 citations
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TL;DR: In this article, high-resolution scanning electron microscopy (SEM) observations were used to determine the morphology of each grain with quantitative measurement of the grain's orientation via electron backscatter diffraction in SEM.
113 citations
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TL;DR: The crystal structure for the composition with a La/W nominal atomic ratio of 5.6 is solved by combining powder X-ray and powder neutron diffraction techniques, substantially differs from that previously reported for Ln(6)WO(12) (Ln = Y, Ho).
Abstract: Lanthanum tungstates with a La/W atomic ratio between 6 and 4.8 have been synthesized as polycrystalline materials using the freeze-drying wet-chemical precursor method. Our results show that a single phase material is obtained when the La/W ratio is between 5.3 and 5.7 (T = 1500 °C). Outside this compositional range, segregation of either La2O3 (La/W ≥ 5.8) or La6W2O15 (La/W ≤ 5.2) are found. We have solved the crystal structure for the composition with a La/W nominal atomic ratio of 5.6 by combining powder X-ray and powder neutron diffraction techniques. This structure substantially differs from that previously reported for Ln6WO12 (Ln = Y, Ho). The main differences between the two structure types are the crystal symmetry, the different coordination environment of the cations and the formula unit. The formula unit can be written as La6.63W1.17O13.43 (Z = 4; calculated density = 6.395 g/cm3), well in accordance with the diffraction techniques, He-pycnometry and electron probe microanalysis. These materials can be described as a face centred cubic structure with space group F3m. Lattice parameters vary between 11.173 and 11.188 A, depending on composition. Dense ceramic materials are obtained at 1400 °C, and microanalyses measurements indicate that no significant tungsten evaporation occurs compared to the nominal values. Compositions with La2O3 segregation show similar conductivity values as the single phase ones, but those containing segregation of W-rich phases show a considerable drop in conductivity with increasing content of the secondary phase.
113 citations
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TL;DR: In this paper, the effect of tungsten and carbon additions on the lattice parameter, crystallographic structure, magnetic saturation, and tensile properties of cobalt alloys was investigated.
113 citations