Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode
文献类型：期刊论文
| 作者 | Cheng, Yin1,2; Wang, ShiYang1; Sun, Yuan1; Yang, YanHong1; Zhou, YiZhou1 |
| 刊名 | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
 |
| 出版日期 | 2022-11-01 |
| 卷号 | 108页码:9 |
| 关键词 | Electronic materials Active layer Valence states Work function Scandium-tungsten (Sc-W) cathodes |
| ISSN号 | 0263-4368 |
| DOI | 10.1016/j.ijrmhm.2022.105958 |
| 通讯作者 | Sun, Yuan(yuansun@imr.ac.cn) ; Zhou, YiZhou(yzzhou@imr.ac.cn) |
| 英文摘要 | Scandium-tungsten (Sc-W) cathodes have garnered a lot of research attention due to their high emission current density. Herein, the cathode working environment is simulated by heating in a vacuum chamber, and scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) are used to study the surface morphology and chemical oxidation states in the temperature range of 25 degrees C to 1300 degrees C. The results reveal that the surface of the tungsten matrix is obviously recrystallized with increasing temperature. Moreover, the scandium oxide becomes globular and clear depressions or holes occur in the aggregation region of the rare-earth oxide at the grain boundaries. The work function is measured by the Richardson method at room temperature, 1000 degrees C, and 1300 degrees C and is found to be 2.77, 2.72, and 2.88 eV, respectively. The work function of the cathode initially decreases with increasing temperature, followed by a gradual increase. This is due to the fact that active substances such as scandium oxide are severely lost at high temperatures, destroying the surface structure of the sample. As the Sc/W value decreases, the rate of depletion of active material from the surface is greater than the rate of replenishment of material to the surface. |
| 资助项目 | National Science and Technology Major Project[J2019 -VI -0018-0133] ; Key Specialized Research and Development Breakthrough-unveiling and Commanding the Special Project Program in Liaoning Province[2021JH15] ; Transformation of scientific and technological achievements[20-203-5-19] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000841249200001 |
| 出版者 | ELSEVIER SCI LTD |
| 资助机构 | National Science and Technology Major Project ; Key Specialized Research and Development Breakthrough-unveiling and Commanding the Special Project Program in Liaoning Province ; Transformation of scientific and technological achievements |
| 源URL | [http://ir.imr.ac.cn/handle/321006/174497]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Sun, Yuan; Zhou, YiZhou |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cheng, Yin,Wang, ShiYang,Sun, Yuan,et al. Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode[J]. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,2022,108:9. |
| APA | Cheng, Yin,Wang, ShiYang,Sun, Yuan,Yang, YanHong,&Zhou, YiZhou.(2022).Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode.INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS,108,9. |
| MLA | Cheng, Yin,et al."Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode".INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 108(2022):9. |
入库方式： OAI收割
来源：金属研究所
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