A study of Eu2O3, Sc2O3 co-doped tungsten matrix impregnated cathode |
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Authors: | Jinshu Wang Xi Wang Wei Liu Tao Gao Yiman Wang |
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Institution: | School of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, PR China |
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Abstract: | Eu2O3 and Sc2O3 co-doped W matrix impregnated cathodes have been prepared by the powder metallurgy method. The constitution of active elements on activated cathode surface is analyzed by in-situ Auger electron spectroscopy. It is found that although Eu exists in the matrix, no Eu is found on the cathode surface due to the formation of a stable Eu containing compound. Sc, Ba and O diffuse to the surface of the cathode and form an active surface layer during the activation period whereas the stable Eu-compound cannot liberate free Eu, which can diffuse from the cathode to the surface. The active substance of Sc, Ba and O on the cathode surface contribute to the emission property. |
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Keywords: | A Alloys A Metals |
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