The investigation of the preparation of submicrograin (of several micrometers) dense strong ceramics of alumina (Al₂O₃) nanopowder has been carried out. The obtained ceramic properties were investigated with the use of SEM, TEM, XRD, luminescence spectroscopy. It was shown that the ceramics of different composition irradiate visible light at different wavelength ranges being excited by ultraviolet lasers. The intensive well separated luminescense red peak at 2.0 eV o was observed in ceramics Al₂O₃ nanopowder basis at all ceramics sintering temperature. The range of ceramics sintering temperature is 1200-1600 ⁰C.  The decay time of this red band is exponential at room temperature. The sintering process of the different produced above-mentioned nanopowders and the resulting ceramics strongly depend on size and shape of particles of the used powders. The data about the shape-formation and coagulation of ceramic samples at different powders combination were received. At moderate density, the microhardness 16-35 GPa for some of sintered strong samples of submicrograin (of several micrometers) structure had been achieved. Using different schemes of pressing and sintering temperature we can change pores size and grains of ceramics.

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