Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode

doi:10.1016/j.ijrmhm.2022.105958

IMR OpenIR

	Influence of different temperatures on morphology and chemical state of the surface-active layer of scandium-tungsten cathode
	Cheng, Yin 1,2; Wang, ShiYang 2; Sun, Yuan 2; Yang, YanHong 2; Zhou, YiZhou 2
通讯作者	Sun, Yuan(yuansun@imr.ac.cn) ; Zhou, YiZhou(yzzhou@imr.ac.cn)
	2022-11-01
发表期刊	INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
ISSN	0263-4368
卷号	108 页码:9
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.
关键词	Electronic materials Active layer Valence states Work function Scandium-tungsten (Sc-W) cathodes
资助者	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
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000841249200001
出版者	ELSEVIER SCI LTD
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/174498
专题	中国科学院金属研究所
通讯作者	Sun, Yuan; Zhou, YiZhou
作者单位	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
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.