Abstract
The boron-scandium system has been studied in a large range of temperature (1200–2200°C) and composition ( 2 ⩽ B Sc ⩽ 100 ) by borothermic reduction of Sc 2O 3 under high vacuum. Only two borides, ScB 2 and ScB 12 with a definite composition, have been obtained. ScB 2 has a A1B 2 structure; it sublimates without decomposition above 1800°C in a 10 −6torr vacuum. ScB 12 has not the previously reported UB 12 structure; its powder pattern and density agree with the tetragonal cell proposed by Matkovich et al.; it melts congruently at 2040 ± 50° C. For high B Sc ratios a solid solution of scandium in β-rh. boron is obtained. The existence of ScB 4 and ScB 6 is not confirmed.
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