The Preparation of a New Crystalline Modification of Boron, and Notes on the Synthesis of Boron Triiodide

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Abstract
Boron triiodide has been made in yields as high as 70% from boron and iodine at 900°C. An equilibrium apparently limits the yield to 49% at 1050°C. An approximate free energy equation, of , has been derived for the reaction . Molybdenum metal may catalyze the reaction. A new and denser form of crystalline boron has been deposited on tantalum in the temperature range 800°–1000°C from boron triiodide. Small portions of the deposit occur as red crystals with a density of 2.4595 at 22.6°. The main impurity is 0.04% iodine. The red boron is composed of units of nearly regular icosahedra in a slightly deformed cubic close packing.

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