FIELD: inorganic compounds production. SUBSTANCE: product of invention contains particles of monocrystalline α- aluminum oxide which are homogeneous and include no seed crystals, have octa- or higher polyhedral form and D/H ratio from 0.5 to 3.0 where D is maximum particle diameter parallel to the plane of hexagonal lattice in hexagonal tightly packed lattice of particles and H is diameter perpendicular to the plane of hexagonal lattice, have average particle size of the main fraction within the range from 0.1 to 5 mcm and narrow particle size distribution. EFFECT: improved special characteristics of product. 10 cl, 7 dwg , 2 tbl
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