| Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode | |
| Cheng, Yin1,2; Wang, ShiYang2; Sun, Yuan2; Yang, YanHong2; Zhou, YiZhou2 | |
| Corresponding Author | Sun, Yuan(yuansun@imr.ac.cn) ; Zhou, YiZhou(yzzhou@imr.ac.cn) |
| 2022-11-01 | |
| Source Publication | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
 |
| ISSN | 0263-4368 |
| Volume | 108Pages:9 |
| Abstract | 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. |
| Keyword | Electronic materials Active layer Valence states Work function Scandium-tungsten (Sc-W) cathodes |
| Funding Organization | 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 |
| DOI | 10.1016/j.ijrmhm.2022.105958 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000841249200001 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/174498 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Sun, Yuan; Zhou, YiZhou |
| Affiliation | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China |
| Recommended Citation 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. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment