Abstract α-Be 3 N 2 powder was obtained by reacting Be metal with dry, flowing N 2 at 1600 K. The product contained 5.9(7) wt.% of BeO. The anti-bixbyite structure suggested earlier was verified through Rietveld refinement on the basis of X-ray powder data (Ia3 (#206); a = 814.518(6) pm). The optical band gaps of α-Be 3 N 2 , Mg 3 N 2 and Ca 3 N 2 are compared with newly measured values for Mg 3 N 2 , Ca 3 N 2 and CaMg 2 N 2 .
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Reckeweg et al. (2003) studied this question.