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To find the changes of surface compositions during life time of the Scandia-doped impregnated dispenser cathodes, two cathodes have been tested at an activation temperature of 1150°CB-Mo and an operation temperature of 1000°CB-Mo, respectively, in an AES system up to more than 7,000 hours. Surface compositions were monitored in-situ at intervals. The tested results have been reported and discussed...
A new kind of cathode, LaC2-Mo cathode was prepared through spark plasma sintering method by using the mixed powder of LaC2 which was prepared by vacuum melting method and molybdenum. It was found that the emission properties of LaC2-Mo cathode increases with the LaC2 content increasing. The emission current density of LaC2-Mo cathode which contains 3.5wt.% LaC2 could reach 0.90A/cm2 at 1400b whereas...
High current density scandate cathodes have aroused great interest in recent years. In this paper the emission performances of scandate cathodes and the possible chemical and physical processes occurred during cathode manufacturing and operation are summarized. Emission mechanisms are further discussed. The major problems of this kind of cathode and its application prospects are reviewed.
Emission properties of nanosized scandia doped dispenser (SDD) cathodes tested at pulse mode with different pulse widths and duty cycles as well as at DC mode are reported and discussed in this paper.
Emission properties of Scandia Doped Dispenser (SDD) cathodes tested in Pierce Gun open structures have been reported in this paper. 80-100 A/cm2 Space-Charge Limited (SCL) current densities have been obtained at designed anode voltages and normal operating temperatures for cathodes with either flat surfaces or concave surfaces. The influences of anode effects on cathodes, which appear in close-spaced...
A new kind of pressed scandate dispenser cathode was fabricated by liquid-liquid doping using a Sol-Gel technique. The cathode exhibits high emission property. i.e., the emission current density reached 47 A/cm2 at 850degCb with lower Richardson work function about 1.1-1.2 eV and Ba:Sc:O concentration ratio at the cathode surface was 1.6:1:2.0.
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