METHOD FOR PRODUCTION OF GLASS-CERAMIC MATERIAL WITH RARE EARTH ELEMENTS NIOBATES NANOSCALE CRYSTALS Russian patent published in 2017 - IPC C03B32/02 C03C10/02 C03C3/95 

FIELD: chemistry.

SUBSTANCE: method for glass-ceramic material production, mol %: Li₂O - 10-30, Al₂O₃ - 12-35, SiO₂ - 40-78, Nb₂O₅ - 2-6 , Y₂O₃ - 0.01-6 , Er₂O₃ - 0.01-4 , Yb₂O₃ - 0.01-4, Eu₂O₃ - 0.1-4; Ho₂O₃ - 0.1-4; Tm₂O₃ - 0.1-4, Tb₂O₃ - 0.1-4, Pr₂O₃ - 0.1-4, Nd₂O₃ - 0.1-4, Dy₂O₃ - 0.1-4, Sm₂O₃ - 0.1-4 where Nb₂O₅, Y₂O₃, Er₂O₃, Yb₂O₃, Eu₂O₃, Ho₂O₃, Tm₂O₃, Tb₂O₃, Pr₂O₃, Nd₂O₃, Dy₂O₃, Sm₂O₃ are introduced in excess of 100% of the basic composition. Oxides are mixed and ground until a homogeneous mixture is obtained, poured into a quartz crucible and placed in a ceramic silit furnace. Mixture is melted at a temperature of 1560-1600°C for 3-8 hours. Then, the molten glass is cooled to a temperature of 1400-1500°C, cast to impart the desired shape and annealed at a temperature of 600-700°C for one hour. Next, the preform is cooled and subjected to further isothermal heat treatment in a temperature range of 700-1350°C for 1-48 hours followed by inertial cooling to room temperature.

EFFECT: obtaining of glass-ceramics with luminescence in the visible and near-IR regions, properties stability, high mechanical strength.

2 cl, 2 tbl, 1 dwg