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With the rapid development of broadcasting, communication and aviation industry, the study of vacuum electron devices has become the key issue of the researchers around the world. Being the heart of electron tubes and magnetrons, the cathode plays an important role in these devices. Two kinds of cathodes, rare earth oxide-Mo cermet (RE2O3-Mo in brief) secondary emission materials and Scandia doped...
La 2 O 3 and Y 2 O 3 co-doped Mo secondary emitters were prepared by three kinds of doping method combined with high temperature plasma sintering. The secondary electron emission property and microstructure of the cathodes were studied. It showed that the cathode prepared by liquid-liquid doping method exhibited the best emission property among all the samples prepared...
The emission property of Y2O3-Mo emitter depends on the contentration of Y2O3. Y2O3-Mo with 4wt% Y2O3 could be used as a thermionic emitter and that with higher content of Y2O3 (> 10wt%) could be served as a secondary emitter.
A RE2O3-Mo cathode which contains Lu2O3 and Y2O3 with a certain weight ratio was made using a Sol-Gel technique and the spark plasma sintering technique. The maximum secondary emission yield (deltam) of this cathode could reach 4.6 while the activation temperature is only 900degC.
Secondary emission has been used in many fields stimulated by the development of vacuum electronic technology, especially in the field of high power magnetron. The development of high power magnetron needs cathodes which could provide high secondary emission yield (Vasilyva, 1996). As a novel cathode which is expected to be applied in magnetron, CeO2-Y2O3-Mo cermet cathode has be prepared by liquid-liquid...
The secondary electron emission properties of rare-earth-doped molybdenum emitter made by aqueous solution-solid doping method, its microstructure and surface behavior are discussed in this paper. The experimental results show that adding rare-earth oxides La 2 O 3 ,Y 2 O 3 and Gd 2 O 3 into molybdenum raises the maximum secondary electron yield δ ...
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