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Transformation of boehmite-derived alumina gel to a-Al2O3 in unseeded gels is strongly influenced by the parent phase, 0-Al2O3. In seeded gels the perfect structure of the epitaxial substrate (a-Al2O3, 0.3 wt. %) influences the surrounding defect 0-phase resulting in (a) fewer imperfections due to lower transformation enthalpy to a-Al2O3, and (b) multiple nucleation sites of a-Al2O3 at the a-Al2O3 seed surface. The rate of transformation expressed for the same number of a-Al2O3 nuclei in unseeded and seeded gels indicates that it is faster in the unseeded gel than in the seeded gel.

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