Size Control of α‐Al<sub>2</sub>O<sub>3</sub> Platelets Synthesized in Molten Na<sub>2</sub>SO<sub>4</sub> Flux

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<jats:p>α‐Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> platelet powders were synthesized in molten Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> flux. The size of α‐Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> platelets was significantly reduced when partially decomposed rather than pure Al<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> was used as the source of Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>; a further reduction in the platelet size was realized through additional seeding with nanosized α‐Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> seeds. The addition of microsized α‐Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> platelet seeds significantly influenced the platelet morphology of the final powder, as well. The platelet size of the final powder was in direct proportion to the size of the platelet seeds, and was in reverse proportion to the cube root of the platelet seed content.</jats:p>

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