The adsorption and diffusion properties of scandium atom on the surfaces of tungsten and noble metals
作者： Chen Lai , Jinshu Wang , Fan Zhou , Wenyuan Zhou , Yazhou Hua
DOI: 10.1016/J.APSUSC.2018.07.010
关键词: Scandium 、 Tungsten 、 Thermionic emission 、 Metal 、 Cathode 、 Atom 、 Adsorption 、 Density functional theory 、 Physical chemistry 、 Materials science
摘要: Abstract As for the scandate cathode, performance of Sc atom, including adsorbability and diffusivity, plays an important role in emission property stability cathode. W is most widely used matrix metal thermionic cathodes, however, cathode suffers from recovery scandium after ion bombardment. Herein, adsorption properties diffusion atom on surfaces W, Ir, Os, Re Ru are systematically studied with density functional theory (DFT). It found that adsorbabilities diffusivities surface order as W(0 1 1) 11 2 ¯ 1 ) Ir(
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