GLASS FOR DARK-RED GLASS-CRYSTALLINE MATERIAL WHICH IS TRANSPARENT IN INFRARED REGION OF SPECTRA Russian patent published in 1995 - IPC

FIELD: glass production. SUBSTANCE: proposed glass contains (mass %): silicium oxide having essential formula SiO₂ 57-61.9, aluminium oxide having essential formula Al₂O₃ 23-28, lithium oxide having essential formula Li₂O 4.5-5.5, sodium oxide having essential formula Na₂O 0.1-1.2, potassium oxide having essential formula K₂O 0.1-1.0, barium oxide having essential formula BaO 4.0-6.0, titanium oxide having essential formula TiO₂ 1.5-3.5, manganese oxide having essential formula MnO₂ 0.1-0.5, cobalt oxide having essential formula CoO 0.01-0.4, zirconium oxide having essential formula ZrO₂ 1.0-2.0, cadmium oxide having essential formula CdO 0.01-2.5, nickel oxide having essential formula NiO 0.35-1.5, antimony oxide having essential formula Sb₂O₃ 0.1-1.0, arsenious oxide having essential formula As₂O₃ 0.1-1.0. Heat treatment of said glass is carried out at 640-670 C, 740-780 C, 820-880 C, total time of heat treatment is 72-180 h. Transmission thus prepared material at wavelength 700 nm is 50-60 %. EFFECT: improves quality of the material desired material. 2 tbl