Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5468126 | Vacuum | 2017 | 6 Pages |
Abstract
The crystal electronic structure and work functions of single crystal LaB6 typical crystal surfaces were systematically studied. The electronic structure calculation shows that the LaB6 have metallic property and the large density of state near the Fermi level of LaB6 is mainly composed of La 5d, 6s and B 2p. The work functions of typical (100), (110), (111), (210), (211), (310) surfaces calculation shows that the (100) surface with highest La concentration and regular symmetric surface structure, providing a lowest work function 2.40eV and (110), (111), (210), (211), (310) work functions are 2.43Â eV, 2.68Â eV, 2.51Â eV, 2.54Â eV, 2.52Â eV, respectively. The thermionic emission test results show that the effective work functions of the single crystal LaB6 on (100), (110), (111), (210), (211), (310) surfaces are 2.66Â eV, 2.73Â eV, 2.78Â eV, 2.69Â eV, 2.72Â eV, 2.71Â eV, respectively. Thus, the actual performance is basically accordant with the calculated value and the (100) surface of LaB6 single crystals should provide better emission performance in practical application.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Hongliang Liu, Xin Zhang, Shuyu Ning, Yixin Xiao, Jiuxing Zhang,