La₂O₃-Gd₂O₃-Mo secondary emission material

来源期刊：中国有色金属学报(英文版)2003年第1期

论文作者：王金淑 刘娟 周美玲 李洪义 张久兴 左铁镛

文章页码：38 - 41

Key words：La₂O₃-Gd₂O₃-Mo; secondary emission; cathode

Abstract: A new kind of materials La₂O₃-Gd₂O₃-Mo has been produced by powder metallurgy method. The composition and microstructure of the material were studied by XRD and SEM. It shows that no chemical reaction takes place among La₂O₃, Gd₂O₃, Mo and the rare earth oxides exist along molybdenum grain boundaries and in the pores. The emission property measurement results of this material show that adding rare earth oxide into molybdenum can improve the secondary emission coefficient of the emitter, and the emission property depends on the activating temperature. After La₂O₃-Gd₂O₃-Mo was activated at 1360℃, the maximum secondary emission coefficient can be high to 2.62, which has exceeded that for practical uses(2.0).