NDLI: Preparation and Evaluation of the Ammonium Perrhenate Impregnated Ni Sponge Oxide Cathode

Content Provider	IEEE Xplore Digital Library
Author	Xiaoxia Wang Yan-Wen Liu Ji-Run Luo Qinglan Zhao Yun Li Qi Zhang
Copyright Year	1963
Abstract	To improve emission performance of the Ni sponge oxide cathodes, a Ni-Re sponge was prepared by impregnating an Ni sponge in an ammonium perrhenate (NH₄ReO₄) solution and then a cathode was fabricated using this Ni-Re sponge. At 850°Cbr, the dc emission current density of a typical impregnated Ni-Re sponge cathode is 5.21 A/cm² and the pulsed emission current density reaches 35.6 A/cm² with a 10- μs pulsewidth. Lifetime tests were carried out under different temperatures. After working under 800°C for 3000 h, the decreases of the dc emission current density is less than 5% from the initial value of 1.63 A/cm². Under 780°C, the dc emission current density even rises instead of attenuating and is still 14% higher than the initial value of 1.0 A/cm² after 5000 h of operation. Furthermore, the thermal electron spectrometry analysis and the work function distribution test show that the emission uniformity of the Ni-Re sponge oxide cathode fabricated by this liquid-solid mixing method is better than that of the conventional Ni-Re sponge oxide cathode fabricated by the solid-solid mixing method.
Sponsorship	IEEE Electron Devices Society
Starting Page	605
Ending Page	610
Page Count	6
File Size	1294909
File Format	PDF
ISSN	00189383
Volume Number	61
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Nickel Current density Heating Testing Surface treatment Powders thermal electron spectrometer Ammonium perrhenate $({\rm NH}_{4}{\rm ReO}_{4})$ emission performance oxide cathode
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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