Abstract
The direct synthesis of BI 3 has been studied in the temperature range 600–1000 °C by using a Pyrex closed-tube reactor with boron selectively heated by an image furnace. On the basis of the results obtained, the chemical transport of boron with iodine has been investigated by means of a standard sealed tube method and a modified de Boer iodide process. On condition that corrosion by BI 3 is avoided, transport proceeds from a colder to a hotter zone according to the exothermic reversible reaction B + 3 2 I 2 BI 3 Synthesis of BI 3 appears to be the major controlling step in the transport yield and rate. Elsewhere, an important purification effect is pointed out.
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