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000000096 037__ $$aENY-ARTICLE-2008-078
000000096 041__ $$aeng
000000096 088__ $$aI07/1996/I-250
000000096 100__ $$aMazurek, B$$uWroclaw University of Technology, Poland
000000096 245__ $$aInvestigations of the field emission current from bismuth ceramic cathodes
000000096 260__ $$c1996-01-01
000000096 300__ $$a5p
000000096 500__ $$aXVIIth International Symposium on Discharges and Electrical Insulation in Vacuum. ISDEIV. Proceedings, Berkley, California, July 21-26, 1996. Vol. 2. Piscataway, NJ : IEEE, 1996. pp. 818-822
000000096 520__ $$aIn this work the investigations of the emission current from BizSrzBazCu30axn d Bi2Sr2BaCu2Ox ceramic cathodes are presented. Experiments were carried out in the vacuum chamber at pressure within the range of Tr 10-8(10-6 Pa), with DC high-voltage power supply and high-class digital electrometer. Current-voltage and Fowler-Nordheim characteristics for the cathodes superconducting in liquid nitrogen temperature were obtained for various distances between electrodes. Current vs. temperature characteristics were also measured. For some measurements the transparent anode technique was employed in order to provide informations about emission origin point. Emission current was registered for the electron emission originating from a single emission center.Superconducting state did not influence current-voltage dependences. It was observed for superconducting cathodes that emission current abruptly changes in the vicinity of the superconducting transition temperature T,. Emission current was stable and practically constant for the temperatures below T, and became unstable and noisy for the temperatures above T,. Emission current rate depends on the temperature range of the superconducting transition AT,.. Superconducting parameters of the cathodes: critical temperature T,, temperature range of the superconducting transition AT, and critical current density j, were also measured. It was found that sorbtion phenomena on the surface of cathodes during cooling and heating of the electrodes influence emission current values and play major role in the emission phenomena.
000000096 6531_ $$aemission current
000000096 6531_ $$asuperconductivity
000000096 700__ $$aZiaja, J$$uWroclaw University of Technology, Poland
000000096 700__ $$aNoras, M$$uWroclaw University of Technology, Poland
000000096 8560_ $$
000000096 8564_ $$u$$zAccess to Fulltext
000000096 909CO $$$$pglobal
000000096 980__ $$aARTICLE