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PRESENCE OF CARBON IN ALUMINUM BORIDES,
CARBORUNDUM CO NIAGARA FALLS N Y
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The effect of carbon on the formation of the reported phases in the aluminum-boron system was investigated. The results indicate that there are only three pure binary aluminum borides, AlB2, alpha AlB12, and gamma AlB12. The phase referred to in the literature as beta AlB12 was found to correspond to a stoichiometry C Al2B32. The phase referred to in the literature as AlB10 was found to correspond to stoichiometry C4AlB24. Both ternary, Al-B-C, phases have an integral number of formula units per crystallographic unit cell. A new ternary phase corresponding to the formula Al4C4B1-3 has been discovered. A method for preparation of crystals of each phase is described. Author
APPROVED FOR PUBLIC RELEASE