Abstract
WE have found that a fine tungsten filament at a very dull-red temperature placed in a stream of nitrogen undergoes a considerable (10–25 per cent.) lowering of its resistance (for constant current flowing through it) when active nitrogen produced up-stream by a condensed discharge passes over it. At the game time the colour changes to a much duller red, that is, the radiation is decreased. These changes persist until the filament is momentarily flashed at a white heat, whereupon the original condition is regained. Apparently a surface layer of some sort forms on the filament and produces a lowering of its temperature. The resistance of the filament at room temperature is the same either witli or without the layer.
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KENTY, C., TURNER, L. Surface Layers on Tungsten produced by Active Nitrogen. Nature 120, 332 (1927). https://doi.org/10.1038/120332a0
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DOI: https://doi.org/10.1038/120332a0
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