The authors examine the boric oxide-ammonia route with special stress on the yield and composition of the intermediate addition compound (BN)x(B203)y(NH3),. It has been concluded that B20~ and NH 3 present in the addition compound formed between 350°C and 900°C cannot be further reacted to convert the B203 into BN and the BN yield remains at around 66~. A formula (BN)12.7(B2Oa)7.sNH 3 has been suggested for the addition compound.
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