Abstract
Boride powders of ZrB 2, NbB 2, CrB 2, and LaB 6 generally contain 0.1–0.5 wt.% of carbon. To remove the carbon impurities, the borides were mixed with the corresponding metal oxides and boron powders and heated in a vacuum at 1600 °C to eliminate carbon as carbon monoxide gas. That is, ZrB 2 (C) + x(ZrO 2 + 4B) → (1 + x)ZrB 2 + 2 xBO↑ (+CO↑) in the case of ZrB 2. This process decreased the carbon content by more than one order of magnitude to less than 0.01 wt.% (<100 ppm), which was low enough for use in feed rods for floating-zone crystal growth.
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