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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Our work on Sc2O3-W matrix dispenser cathodes had been reviewed in this paper. The cathode with uniform distribution of Sc2O3 had been obtained using liquid-liquid doping method. The cathode had excellent emission property, i.e., the emission current density in pulse condition could reach over 35 A/cm2. It was found that the cathode surface was covered by a Ba-Sc-O active substance multilayer with a thickness of about 100 nm, which was different from the monolayer and semiconducting layer in thickness. Furthermore, the observation results displayed that nanoparticles appeared at the growth steps and the surface of tungsten grains of the fully activated cathode. The calculation result indicated that the nanoparticles could cause the increase of local electric f eld strengths. We proposed the emission model that both the Ba-Sc-O multilayer and the nanoparticles distributing mainly on the growth steps of the W grains contributed to the emission. The future work on this cathode has been discussed.
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참고문헌 (20)
참고문헌 신청
Gaertner G / 2002 / Low temperature and cold emission of scandate cathodes / Appl. Surf. Sci 201:61~68
Gibson J W / 1989 / Investigation of scandate cathodes: emission, fabrication, and activation processes / Electron Devices IEEE Transactions on 36:209~214
Green M C / 2008 / Cathode technology overview: current status and future directions / Proceeding of 2008 IEEE International Vacuum Electronics Conference :3~4
Hasker J / 1986 / Properties and manufacture of top-layer scandate cathodes / Appl. Surf. Sci 26:173~195
Liang W / 2014 / DC emission characteristic of nanosized-scandia-doped impregnated dispensercathodes / IEEE Transactions on Electron Devices 61:1749~1753
Gibson J W / 1989 / Investigation of scandate cathodes: emission, fabrication, and activation processes / Electron Devices IEEE Transactions on 36:209~214
Green M C / 2008 / Cathode technology overview: current status and future directions / Proceeding of 2008 IEEE International Vacuum Electronics Conference :3~4
Hasker J / 1986 / Properties and manufacture of top-layer scandate cathodes / Appl. Surf. Sci 26:173~195
Liang W / 2014 / DC emission characteristic of nanosized-scandia-doped impregnated dispensercathodes / IEEE Transactions on Electron Devices 61:1749~1753
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