Abstract
The carbothermal reduction and nitridation (CRN) reactivity of alumina (Al2O3) to aluminum nitride (AlN) under a flow of nitrogen was investigated for transition aluminas (γ- and δ-Al2O3) and α-Al2O3 with the same particle size and mixing homogeneity with carbon. The aluminas were obtained by calcining a (hydroxo)(succinato)Al(III) complex under a flow of nitrogen, argon, or mixed gas of nitrogen and carbon monoxide. The transition aluminas were converted to AlN without any transformation into α-Al2O3. The CRN reactivity of Al2O3 decreased in the following order: γ-Al2O3 > δ-Al2O3 >> α-Al2O3. The difference in their CRN reactivities was attributed to the difference in the ratio of AlO4 sites to AlO6 sites among the three phases. The CRN reactivity decreased with increasing crystallinity.
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