Chemical States of Lanthanum in Carbonized La2O3-Mo Thermionic Cathode Materials |
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作者姓名: | 王金淑 周美玲 王亦曼 张久兴 聂祚仁 左铁镛 |
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作者单位: | TheKeyLaboratoryofAdvancedFunctionalMaterials,MinistryofEducationChina,SchoolofMaterialsScienceandEngineering,BeijingPolytechnicUniversity,Beqing100022,China |
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基金项目: | ProjectsupportedBeijingNewStarResearchProgram ( 95 4810 70 0 )andFundamentalResearchProgram 973Program
(G19980 613 16) |
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摘 要: | The chemical reaction between lanthanum oxide and molybdenum carbide was studied by thermodynamic calcu-lation, thermal analysis and in-situ X-ray Photoelectron Spectroscopy. The theoretical results show that at the environment allowing for the evaporation of lanthanum, such as in high vacuum, La2O3 in the La2O3-Mo materials can be reduced to metallic lanthanum by molybdenum carbide (Mo2C). To confirm the conclusion, many analysis methods such as XRD, SPS, and TG-DTA were taken. The experimental results show that the chemical state of lanthanum changes during heat-ing. It was proved, for the first time, that reacted metallic lanthanum appears at the surface of this kind of material at high temperature.
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关 键 词: | 化学态 镧 La2O3-Mo 热离子阴极材料 稀土 |
Chemical States of Lanthanum in Carbonized La2O3-Mo Thermionic Cathode Materials |
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Abstract: | The chemical reaction between lanthanum oxide and molybdenum carbide was studied by thermodynamic calculation, thermal analysis and in situ X ray Photoelectron Spectroscopy. The theoretical results show that at the environment allowing for the evaporation of lanthanum, such as in high vacuum, La 2O 3 in the La 2O 3 Mo materials can be reduced to metallic lanthanum by molybdenum carbide (Mo 2C). To confirm the conclusion, many analysis methods such as XRD, SPS, and TG DTA were taken. The experimental results show that the chemical state of lanthanum changes during heating. It was proved, for the first time, that reacted metallic lanthanum appears at the surface of this kind of material at high temperature. |
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Keywords: | chemical state lanthanum La 2O 3 Mo cathode rare earths |
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