Conclusions
-
1.
Investigation has been carried out of the physical properties (specific electrical resistance in the range 293–1273° K, the parameters of the thermal emission and the coefficient of radiation in the range 1200–1950° K, and microhardness) and a study has been made also of the phase composition of the alloys of the W-LaB6 system (from 1 to 50 mol. % LaB6).
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2.
It was shown that, during the interaction of tungsten with LaB6, the borides of tungsten W2B and WB are formed with the corresponding decomposition of lanthanum boride and an increase in electrical resistance.
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3.
A study of the thermoemission properties showed that small additions of LaB6 (of the order of 1 mol. %) to tungsten sharply decreases the work function and makes possible high emission current densities; this results in the necessity of further studies of the emission properties of this system.
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4.
A preliminary explanation has been given of the observed effect of a sharp decrease in the work function of tungsten with small additions of lanthanum hexaboride. This includes an increase in the statistical importance of the stable d5 configurations in tungsten atoms which enables the nonlocalized electrons of the metallic components to be excited easily in thermoemission.
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Samsonov, G.V., Lapshov, Y.K., Podchernyaeva, I.A. et al. Preparation and physical properties of alloys of the W-LaB6 system. Powder Metall Met Ceram 5, 446–451 (1966). https://doi.org/10.1007/BF00775533
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DOI: https://doi.org/10.1007/BF00775533