Abstract
1. A study was made of conditions under which the zirconium suicides ZrSi2, ZrSi, Zr5Si3, and Zr2Si are produced by the silicothermic reduction of zirconium dioxide in a vacuum. 2. It has been established that silicothermic reduction in graphite furnaces can yield only the suicides ZrSi2 and ZrSi. The lower-silicon phases Zr5Si3 and Zr2Si cannot be produced by this technique. 3. At temperatures in excess of 1700°C, owing to the low thermodynamic stability of the lower suicides and the occurrence of several secondary reactions, the principal reaction products are silicon, which vigorously evaporates, and zirconium carbide.
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