A study of scandia and rhenium doped tungsten matrix dispenser cathode

作者：Wang, Jinshu^*; Li, Lili; Liu, Wei; Wang, Yanchun; Zhao, Lei; Zhou, Meiling

来源：Solid State Sciences, 2007, 9(10): 924-932.

DOI：10.1016/j.solidstatesciences.2007.06.010

• scandia
• rhenium
• doping
• tungsten
• dispenser cathode

Scandia and rhenium doped tungsten powders were prepared by solid-liquid doping combined with two-step reduction method. The experimental results show that scandia was distributed evenly on the surface of tungsten particles. The addition of scandia and rhenium could decrease the particle size of doped tungsten, for example, the tungsten powders doped with SC2O3 and Re had the average size of about 50 nm in diameter. By using this kind of powder, scandia and rhenium doped tungsten matrix with the sub-micrometer sized tungsten grains was obtained. This kind of matrix exhibited good anti-bombardment insensitivity at high temperature. The emission property result showed that high space charge limited current densities of more than 60 A/cm(2) at 900 degrees C could be obtained for this cathode. A Ba-Sc-O multilayer about 100 urn in thickness formed at the surface of cathode after activation led to the high emission property.

• 出版日期2007-10
• 单位北京工业大学