Abstract
The authors examine the boric oxide—ammonia route with special stress on the yield and composition of the intermediate addition compound (BN) x (B2O3) y (NH3) z . It has been concluded that B2O3 and NH3 present in the addition compound formed between 350°C and 900°C cannot be further reacted to convert the B2O3 into BN and the BN yield remains at around 66%. A formula (BN)12·7(B2O3)7·5NH3 has been suggested for the addition compound.
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