| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9572333 | Applied Surface Science | 2005 | 5 Pages |
Abstract
This paper describes the preparation of nano-composite W-La2O3 material by freeze-drying and spark plasma sintering (SPS). The thermionic electron emission capability and surface properties of this material have been investigated. The surface compositions and depth profiles of the prepared material were checked “in situ” by means of AES from 298Â K to 1573Â K. Nano-composite W-La2O3 material exhibits good electron emission performance: a saturated emission current density of 1.46Â AÂ cmâ2 can be reached at 1673Â K with a corresponding work function of 2.79Â eV. The surface analysis results showed that the good emission capability might be related to an about 10Â nm surface layer contained excess La caused by diffusion of La from bulk material to the surface.
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Authors
Xiaoli Xi, Zuoren Nie, Wei Wang, Jiancan Yang, Shiming Hao, Yanqun Guo, Tieyong Zuo,