Journal
VACUUM
Volume 143, Issue -, Pages 245-250Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2017.06.029
Keywords
Lanthanum hexaboride; First-principles; Electronic structure; Work function
Funding
- Beijing Municipal Natural Science Foundation [2112007]
- National Natural Science Foundation of China [51371010, 50801002]
Ask authors/readers for more resources
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 2.43 eV, 2.68 eV, 2.51 eV, 2.54 eV, 2.52 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 2.66 eV, 2.73 eV, 2.78 eV, 2.69 eV, 2.72 eV, 2.71 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. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available