Аннотация:In this report are given the results of a study of the formation of fine -crystalline magnesium
aluminate (MgAl2O4) from magnesium oxide and aluminum hydroxide or oxyhydroxide
(boehmite) in medium of supercritical water fluid at temperature 380 - 400oC, and under
pressure of water fluid 20 - 23 MPa. By varying the synthesis conditions and composition of
supercritical water fluid, the particle size (from 20 nm to 5 microns) and the shape of the
synthesized spinel (from spherical to bipyramidal) regulated. Synthesized by this method the
fine-crystalline magnesium spinel proved as good starting material for the production of
ceramics, in particular, for optical transparent ceramics. From this material were obtained
transparent ceramics with transmission coefficient up to 83% in the red region of the optical
spectrum.
