Thermionic properties of lutetium borides single crystals

Abstract

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.