Title :
Emission energy barriers of scandate surfaces with adsorbed Ba and Ba-O using density functional theory
Author :
Jacobs, Ryan M. ; Morgan, D. ; Booske, John H.
Author_Institution :
Mater. Sci. Program Dept., Univ. of Wisconsin-Madison, Madison, WI, USA
Abstract :
Density functional theory was used to calculate the surface electron emission barriers for the stable (011) and (111) surfaces of bixbyite Sc2O3 in the presence of adsorbed Ba and Ba-O. A low surface barrier of 1.21 eV for a defected BaO monolayer on Sc2O3 (011) was found to be thermodynamically stable. This result provides a straightforward explanation of low effective work function measurements obtained for scandate cathodes.
Keywords :
cathodes; density functional theory; electron emission; scandium compounds; Sc2O3; density functional theory; electron volt energy 1.21 eV; emission energy barriers; scandate cathodes; scandate surfaces; surface electron emission barriers; Barium; Cathodes; Density functional theory; Doping; Electron emission; Jacobian matrices; Temperature measurement; density functional theory; scandate cathode; scandium oxide; surface barrier; work function;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International
Conference_Location :
Paris
Print_ISBN :
978-1-4673-5976-4
DOI :
10.1109/IVEC.2013.6570975
