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- W1982156684 abstract "Tungsten monocrystals grow on tungsten tips welded to the tungsten hairpin filament of the type used in electron microscopes when they are heated in a gas mixture of 80% N2 and 20% H2 in presence of traces of H2O vapor. This growth is shown experimentally to be due to a transport mechanism based on Langmuir's closed cycle (W + 3H2O ⇄ WO3 + 3H2). At the hot regions of the filament (2500 °C) gaseous WO3 is formed which diffuses through the gas at a pressure of 105 Pa to the tip (2200 °C) where it is reduced to metallic W. By using extremely pure H2 and N2 gas and by adding defined quantities of H2O the transport mechanism W + N2 ⇄ WN2 suggested by v. Grote is shown to be of no importance. If the content of water vapor is high and the temperature of the W tip too low, dendrites and many small crystallites are formed due to the smaller surface mobility of the tungsten atoms and the large supply of material." @default.
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- W1982156684 date "1974-03-01" @default.
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- W1982156684 title "Der langmuirsche kreisprozess als transportmechanismus für das wachstum von wolfram-einkristallen in formiergas (80% N2, 20% H2)" @default.
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- W1982156684 doi "https://doi.org/10.1016/0022-0248(74)90051-7" @default.
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