SPECTRAL EMISSIVITY (l = 0,65 mm) OF LUTETIUM BORIDE SINGLE CRYSTALS

D.A. Voronovich, A.A. Taran, N.Yu. Shitsevalova, G.V. Levchenko, V.B. Filipov

The spectral emissivity experimental data of lutetium dodecaboride with three crystallographic direction [100], [110], [111], lutetium tetraboride with [001] direction and lutetium diboride with [001] direction single crystals and its temperature dependences are presented. The near-surface layers structure and composition of these single crystals before and after their heating were studied by scanning electron microscopy method, X-ray microanalysis, X-ray phase analysis, and relation between e_l and surface composition and structure was established.

Key words: lutetium borides, single crystal, spectral emissivity, phase composition, surface structure, actual and brightness temperatures.