the alkali metals, barium is the heaviest and most reactive of the stable elements in its family, the alkaline earths. the element first gained attention in the early th century in bologna, italy, when rocks composed of barium sulfate drew alchemists due to their unique ability to emit a phosphorescent...
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. adding niobium to carbon and alloy steels increase their strength, toughness, and machinability. niobium alloys are often used for arc welding rods for stabilized grades of stainless steel and in the arc-tube seals of high pressure sodium vapor lamps; one of the first commercial uses for the metal...
outstanding photos. the birth of summilux-m mm f/ asph (i) allows the image performance to reach a very high level, and summilux-m mm f/ asph (ii) even consists of greatly enhanced optical design. it shows that leica is able to go from a peak to an even higher peak. summilux-m mm f/ asph (i) was produced...
holmium oxide in . he had great difficulty deriving the metal itself from the oxide , and thus named the element from the greek dysprositos, meaning "hard to get". it is unsurprising that the metal was so hard to isolate, as significant pure quantities of many of the rare earth elements could not be...
gallium arsenide can effectively absorb all the photons from incident sunlight, as opposed to the thick layers of silicon required for the same task. this allows for the creation of one type of thin-film solar cell . gallium arsenide semiconductor devices also exhibit less noise than those produced...
these elements. tellurium also plays a significant role in technology in the form of chalcogenide glasses. these glasses, made using sulfur , selenium , or tellurium compounds, exhibit high refractive indices and non-linear optical effects, and are frequently used in optical fibers for telecommunications...
element . the first reportedly successful synthesis of tennessine was completed as part of a collaboration between american and russian teams in , but sufficient data was not produced by these experiments to justify an official claim of discovery to the iupac. in a team at the gsi research center in...
bromide and iodide manufacturing capacity july , -- american elements announces launch of new line of rotatable sputtering targets july , -- american elements now offers spray dried forms of its oxide, carbide, and selected other metallic powders american elements magnets at the spanish nanophotonics...