Morphological Changes in the Rhenium Field-Emission Cathode Heated under High Electric Field

• IWATA Tatsuo

  Associate Department of Electronic and Information Engeneering, School of Engeneering, Hokkaido Tokai University

• CHANG Kap-soon

  Department of Electronics, School of Engineering

抄録

Morphological changes in the filed emission cathode heated under electric fields were investigated in wide ranges of the electric field strength. A build-up process, which can be characterized with shoulders and stable regions in the emission current versus time curve, was observed in the measurement of the emission current. The activation energy of 2.0±0.2 eV/atom for surface selfdiffusion of Re atoms was deduced from the found build-up process. Small protrusions were formed on the cathode surfaces heated under high fields. As a result of formation of the protrusions there was a 50% reduction in the voltage required for a certain emission current. The observed morphological changes in the cathode could be interpreted by two factors : mechanical deformation deduced by electrostatic force, and the crystal growth induced by the mass transport from the shank to the apex of the cathode.

収録刊行物

• Proceedings of the School of Engineering of Tokai University

  Proceedings of the School of Engineering of Tokai University 23 89-, 1998

  東海大学

キーワード

• Field Emission
• Surface Diffusion
• Electrostatic Force
• Rhenium

詳細情報

• CRID: 1571698601760439680
• NII論文ID: 110000031026
• NII書誌ID: AA11060702
• ISSN: 03880788
• 本文言語コード: en
• データソース種別:
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