Funct. Mater. 2014; 21 (3): 266-273.
Thermionic properties of lutetium borides single crystals
[1] National Aerospace University "Kharkiv Aviation Institute", 17 Chkalov Str., 61070 Kharkiv, Ukraine
[2] I. Frantsevich Institute for Problems of Material Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky Str., 03680 Kyiv 142, Ukraine
Results of the LuB12 (100), (110), (111), LuB4 (001), LuB2 (001) thermionic properties study in the temperature range T = 1200...1960 K at p ≤ 10-4 Pa pressure are presented. The correlation between structure and composition of the lutetium borides single-crystal samples and their thermionic properties are shown. The electron work function anisotropy of the LuB12 low-index planes are determined by the lutetium and boron atoms reticular density and the electric dipole moment of the unreconstructed (100), (110), (111) planes of the UB12 type lattice structure.
1. T.B.Massalski (Editor-in-Chief), Binary Alloy Phase Diagrams, 2-d ed. Plus Updates, ASM International, ASM CD-ROM, Ohio, USA (1996).
2. G.V.Samsonov, L.N.Okhremchuk, I.A.Podchernjaeva et al., Izv. AN SSSR Neorg. Mater., 10, 270 (1974).
3. D.Voronovich, A.Taran, N.Shitsevalova et al., Solid State Sci., 14, 1624 (2012). http://dx.doi.org/10.1016/j.solidstatesciences.2012.04.009
4. H.Werheit, V.Filipov, K.Shirai et al., J. Phys.: Condens. Matter., 23, 065403 (2011). http://dx.doi.org/10.1088/0953-8984/23/6/065403
5. R.Nishitani, M.Aono, T.Tanaka et al., Surface Sci., 93, 535 (1980). http://dx.doi.org/10.1016/0039-6028(80)90281-2
6. L.W.Swanson, M.A.Gesley, P.R.Davis, Surface Sci., 107, 263 (1981). http://dx.doi.org/10.1016/0039-6028(81)90625-7
7. D.A.Voronovich, A.A.Taran, N.Yu.Shitsevalova et al., Aerospace Technic and Technology, 4, 80 (2011).
8. J.M.Lafferty, J. Appl. Phys., 22, 299 (1951). http://dx.doi.org/10.1063/1.1699946
9. V.S.Fomenko, Emission Properties of Materials, Naukova Dumka, Kiev (1981) [in Russian].
10. A.Taran, D.Voronovich, N.Shitsevalova et al., Solid State Phen., 172-174, 464 (2011). http://dx.doi.org/10.4028/www.scientific.net/SSP.172-174.464
11. L.N.Dobretsov, M.V.Gomoyunova, Emission Elektronics, Nauka, Moscow (1966) [in Russian].
12. A.L.Ivanovskii, I.R.Shein, N.I.Medvedeva, Russ. Chem. Rev., 77, 467 (2008). http://dx.doi.org/10.1070/RC2008v077n05ABEH003766