| A Study on La_2O_3-Y_2O_3-Mo Secondary Emission Material |
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| 作者姓名： | 王金淑 刘娟 周美玲 李洪义 张久兴 左铁镛 |
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| 作者单位： | Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University，Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University，Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University，Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University，Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University，Key Laboratory of Advanced Functional Materials of Ministry of Education，School of Materials Science and Engineering，Beijing Polytechnic University Beijing 100022，China，Beijing 100022，China，Beijing 100022，China，Beijing 100022，China，Beijing 100022，China，Beijing 100022，China |
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| 基金项目： | ProjectsupportedbytheNationalKeyFundamentalResearchProgram (973 ) (G19980 613 16)，BeijingNewStarResearchProgram (95 4810 70 0 )，BeijingFundamentalResearchProgram (2 992 0 0 6)，POKYINGTUNGYoungTeacherFinancialProgram(810 40 ) |
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| 摘 要： | Thephenomena ,mechanismandtheapplicationofsecondaryemissionofmanykindsofmaterialshavebeenstudiedsincethesecondaryemissionphenomenawasdiscoveredbyCompellin 1899.Withthedevel opmentofelectronictechnologythephenomenaofsec ondaryemissionhavebeenincreasinglyappliedinmanyfields1,2 ] ,especiallyinhighpowermagnetrontube .Nowadays ,thecathodesofhighpowermag netrontubeusedinthefieldsofbroadcast,correspon denceandnationaldefensearemainlyBa Wcath odes3] andsomeTh Wcathodes .However ,Ba Wcathodeishard…
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A Study on La_2O_3-Y_2O_3-Mo Secondary Emission Material |
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| Wang Jinshu ,Liu Juan,Zhou Meiling,Li Hongyi,Zhang Jiuxing,Zuo Tieyong.A Study on La_2O_3-Y_2O_3-Mo Secondary Emission Material[J].Journal of Rare Earths,2003(6). |
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| Authors: | Wang Jinshu Liu Juan Zhou Meiling Li Hongyi Zhang Jiuxing Zuo Tieyong |
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| Affiliation: | Wang Jinshu ~*,Liu Juan,Zhou Meiling,Li Hongyi,Zhang Jiuxing,Zuo Tieyong |
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| Abstract: | The substrate molybdenum doped with La_2O_3, Y_2O_3 cathode material was made by the powder metallurgy method. The secondary emission coefficients of the materials were tested. The experimental results show that Mo cathodes doped with La_2O_3,Y_2O_3 have good secondary emission properties. When the cathodes are activated, the maximal secondary emission coefficients of these cathodes are higher than 2.0 and can meet the practical requirement. The distribution of the rare earth in the interior and at surface of this kind of cathode material before and after emission was studied using Scanning Electronic Microscopic (SEM) and X-Ray Photoelectron Spectrum(XPS). The analysis results show that the rare earth is easy to gather at grain boundaries and the relevant concentration of rare earth on the surface after emission is obviously greater than that before emission. |
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| Keywords: | metal materials secondary emission molybdenum cathode rare earths |
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