Recent developments in morphological control of alpha-Al2O3 particles synthesized in 1,4-butanediol solution

Direct precipitation of metal oxides from high boiling point organic solven ts presents an alternative to wholly aqueous hydrothermal material synthesi s routes. In the current study, reaction conditions to control particle siz e and shape of alpha -alumina, precipitated from 1,4-butanediol solutions a re described. Synthesis variables including reaction time, stirring speed, amount of methanol, and solid loading have a strong effect on the size and shape of alpha -alumina synthesized in 1,4-butanediol solutions conditions to prepare alpha -alumina crystals with different habits including circular platelets, hexagonal platelets, hexagonal platelets with habit modificatio ns on the edges, dodecahedra, polyhedra with 14 faces, polyhedra with 20 fa ces, hexagonal prisms, and hexagonal prisms with habit modifications on the edges are presented. Possible growth mechanisms of alpha -Al2O3 particles in 1,4-butanediol solution are proposed based on theoretical shape and atom ic surface structure generated with programs SHAPE((C)) and ATOMS((C)). The results of this study indicate that it is possible to control the morpholo gy of synthesized alpha -alumina particles by controlling the process condi tions, and theoretical predictions of crystal shapes can be reconciled to t he morphology of the experimentally synthesized particles.