| La_2O_3-Mo阴极的发射机理 |
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| 引用本文： | 王金淑,周美玲,左铁镛,聂祚仁,张久兴,张国珍.La_2O_3-Mo阴极的发射机理[J].金属学报,2001(6). |
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| 作者姓名： | 王金淑 周美玲 左铁镛 聂祚仁 张久兴 张国珍 |
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| 作者单位： | 北京工业大学材料学院新型功能材料教育部重点实验室!北京100022，北京工业大学材料学院新型功能材料教育部重点实验室!北京100022，北京工业大学材料学院新型功能材料教育部重点实验室!北京100022，北京工业大学材料学院新型功能材料教育部重点实验室!北京100022，北京工业大学材 |
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| 基金项目： | 国家973项目 G1998061316，国家 863计划项目，北京市科技新星 954810700，北京市自然科学基金项目 29 |
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| 摘 要： | 采用热分析、原位ＸＰＳ等方法对 Ｍｏ—Ｌａ２Ｏ３阴极中 Ｌａ的价态进行了研究，探讨了该阴极的发射机理．实验结果表明，在高温下Ｌａ２Ｏ３可以被Ｍｏ２Ｃ还原成单质Ｌａ． Ｌａ２Ｏ３－Ｍｏ阴极的发射可用原子膜机理解释：在阴极工作过程中，还原得到的 Ｌａ覆盖在Ｍｏ基体表面，降低了基体 Ｍｏ的逸出功，促进了阴极的发射根据此机理提出Ｌａ２Ｏ３－Ｍｏ电子管制备和运行工艺．使电子管的工作寿命提高到了满足实际应用要求的水平．
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| 关 键 词： | La2O3-Mo 热阴极 发射机理 价态 |
EMISSION MECHANISM OF La_2O_3-Mo CATHODE |
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| WANG Jinshu,ZHOU Meiling,ZUO Tieyong,NIE Zuoren,ZHANG Jiuxing,ZHANG Guozhen.EMISSION MECHANISM OF La_2O_3-Mo CATHODE[J].Acta Metallurgica Sinica,2001(6). |
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| Authors: | WANG Jinshu ZHOU Meiling ZUO Tieyong NIE Zuoren ZHANG Jiuxing ZHANG Guozhen |
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| Abstract: | The valence of element La in La2O3-Mo cathode material has been studied by using thermal weight analysis and in situ high temperature X-ray photoelectron spectrum. On the basis of experiment result, the emission mechanism of La2O3-Mo cathode has been discussed. It was proved that molybdenum carbide can reduce lanthanum oxide to metallic lanthanum. The emission of La2O3- Mo cathode can be explained as the formation of a monoatomic layer of metallic lanthanum at the surface of a filament. The momoatomic La surface layer has a lower work function than clean molybdenum. Based on the emission mechanism, the preparation and operation techniques of La2O3-Mo electron tubes have been presented. By using the new techniques, the lifetime of La2O3-Mo cathode was improved to the level of practical uses. |
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| Keywords: | La2O3-Mo thermionic cathode emission mechanism chemical state |
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