Abstract
The reaction of aluminum oxide with boron in vacuum was studied over a wide range of temperatures. Analysis of the reaction products was carried out by chemical, x-ray diffraction, optical, and metallographic methods. The temperature dependence of the reaction was determined. A high boron phase of the composition AlB18–31 is produced by the borothermic reduction of aluminum oxide. The crystalline phase possesses a hexagonal structure with the elementary cell parameters a = 1.097, c = 2.378 nm. Aluminum dodecaboride and diboride phases were not detected in the reaction products.
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