Chemisorption and Absorption of Nitrogen with Tantalum
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概要
- 論文の詳細を見る
Sorption of nitrogen on polycrystal tantalum ribbons is studied using a static method in ultra-high vacuum. Saturation coverage is 3._6×10^<14> molecules/cm^2. Sticking probability at room temnerature is 0.1_7 UP to 1._4×10^<14> molecules/cm^2, and abruptly falls to 0.03 at about 2×10^<14> molecules/cm^2. This suggests the existence of multiplex adsorption states in this system. The absorption occurs at temneratures above 500°K, so the desorption from the chemisorption states is not observed. From an analysis of the absorption rate, the nitrogen atoms chemisorbed on the surface of the polycrystal ribbon is shown to be absorbed at the grain boundary. The activation energy of absorption is 1.8eV/2-atoms, and is much smaller than that of diffusion of nitrogen in tantalum. As the concentration of nitrogen in tantalum is proportional to the square root of equilibrium pressure, nitrogen is absorbed in atomic form into the bulk. Desorption from the absorption state is observed at temperatures above 1800°K. The heat of absorption is 4.4eV in the pressure range from 10^<-8> to 10^<-2> Torr.
- 社団法人応用物理学会の論文
- 1970-12-05
著者
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Oguri Takeo
Department Of Physics Faculity Of Science Tokyo Metropolitan University
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OGURI Takeo
Department of Physics, Faculty of Science, Tokyo Metropolitan University
関連論文
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- The Static Operation Mass Spectrometer
- Calorimetric Heats of Chemisorption of Nitrogen on Tungsten at Higher Temperatures
- Calorimetric Studies on Chemisorption of Nitrogen on Tantalum
- Angular Distribution of Scattered Electron and Medium Energy Electron Spectroscopy for Metals
- Studies on Chemisorption of Nitrogen on Tungsten with the Field Emission Microscope
- Chemisorption of Nitrogen on Molybdenum
- Studies on Chemisorption of Nitrogen on Tantalum with the Field Emission Microscope
- Chemisorption of Nitrogen on Tungsten
- Chemisorption and Absorption of Nitrogen with Tantalum