Abstract: An optically detectable, floatable arsenic- and antimony-free, glazable lithium-aluminosilicate glass that can be prestressed and the glass ceramic converted therefrom are described. The glass or the glass ceramic has a composition (in % by weight based on oxide) of essentially SiO2 55-69, Al2O3 19-25, Li2O 3.2-5, Na2O 0-1.5, K2O 0-1.5, MgO 0-2.2, CaO 0-2.0, SrO 0-2.0, BaO 0-2.5, ZnO 0-<1.5, TiO2 1-3, ZrO2 1-2.5, SnO2 0.1-<1, ?TiO2+ZrO2+SnO2 2.5-5, P2O5 0-3, Nd2O3 0.01-0.6, CoO 0-0.005, F 0-1, B2O3 0-2.

Abstract: An optically detectable, floatable arsenic- and antimony-free, glazable lithium-aluminosilicate glass that can be prestressed and the glass ceramic converted therefrom are described. The glass or the glass ceramic has a composition (in % by weight based on oxide) of essentially SiO2 55-69, Al2O3 19-25, Li2O 3.2-5, Na2O 0-1.5, K2O 0-1.5, MgO 0-2.2, CaO 0-2.0, SrO 0-2.0, BaO 0-2.5, ZnO 0-<1.5, TiO2 1-3, ZrO2 1-2.5, 0.1-<1, ?TiO2+ZrO2+SnO2 2.5-5, P2O5 O-3, Nd2O3 0.01-0.6, CoO 0-0.005, F 0-1, B2O3 0-2.

Abstract: An optically detectable, floatable arsenic- and antimony-free, glazable lithium-aluminosilicate glass that can be prestressed and the glass ceramic converted therefrom are described. The glass or the glass ceramic has a composition (in % by weight based on oxide) of essentially SiO2 55-69, Al2O3 19-25, Li2O 3.2-5, Na2O 0-1.5, K2O 0-1.5, MgO 0-2.2, CaO 0-2.0, SrO 0-2.0, BaO 0-2.5, ZnO 0-<1.5, TiO2 1-3, ZrO2 1-2.5, SnO2 0.1-<1, ? TiO2+ZrO2+SnO2 2.5-5, P2O5 0-3, Nd2O3 0.01-0.6, CoO 0-0.005, F 0-1, B2O3 0-2.

Abstract: The invention relates to a glass and a glass-ceramic comprising beta-quartz and/or keatite solid solutions, and to a process for their production, and to their use as substrate material for coating. Glass-ceramic comprising beta-quartz and/or keatite solid solutions with a surface roughness without polishing of Ra<50 nm, a thermal expansion in the temperature range between 20° C. and 300° C. of <1.2·10?6/K, a transmission in the near infrared region at 1050 nm of >85% for a 4 mm thickness, and a composition in % by weight, based on the total composition, containing: Li2O 3.0-5.5?? Na2O 0-2.5 K2O 0-2.0 ? Na2O + K2O 0.5-3.0?? ? MgO + ZnO <0.3 SrO 0-2.0 BaO 0-3.5 B2O3 0-4.0 Al2O3 19.0-27.0?? SiO2 55.0-66.0?? TiO2 1.0-5.5?? ZrO2 0-2.5 ? TiO2 + ZrO2 3.0-6.0?? P2O5 0-8.0 Fe2O3 <200 ppm F 0-0.

Abstract: The invention relates to a glass and a glass-ceramic comprising beta-quartz and/or keatite solid solutions, and to a process for their production, and to their use as substrate material for coating. Glass-ceramic comprising beta-quartz and/or keatite solid solutions with a surface roughness without polishing of Ra<50 nm, a thermal expansion in the temperature range between 20° C. and 300° C. of <1.2•10−6/K, a transmission in the near infrared region at 1050 nm of >85% for a 4 mm thickness, and a composition in % by weight, based on the total composition, containing: Li2O 3.0-5.5   Na2O 0-2.5 K2O 0-2.0 &Sgr; Na2O + K2O 0.5-3.0   &Sgr; MgO + ZnO <0.3 SrO 0-2.0 BaO 0-3.5 B2O3 0-4.0 Al2O3 19.0-27.0 SiO2 55.0-66.0 TiO2 1.0-5.5   ZrO2 0-2.5 &Sgr; TiO2 + ZrO2 3.0-6.0 P2O5 0-8.

Abstract: The invention relates to a glass and a glass-ceramic comprising beta-quartz and/or keatite solid solutions, and to a process for their production, and to their use as substrate material for coating. Glass-ceramic comprising beta-quartz and/or keatite solid solutions with a surface roughness without polishing of Ra<50 nm, a thermal expansion in the temperature range between 20° C. and 300° C. of <1.2·10−6/K, a transmission in the near infrared region at 1050 nm of >85% for a 4 mm thickness, and a composition in % by weight, based on the total composition, containing: 1 Li2O 3.0-5.5 Na2O 0-2.5 K2O 0-2.0 &Sgr; Na2O + K2O 0.5-3.0 &Sgr; MgO + ZnO <0.3 SrO 0-2.0 BaO 0-3.5 B2O3 0-4.0 Al2O3 19.0-27.0 SiO2 55.0-66.0 TiO2 1.0-5.5 ZrO2 0-2.5 &Sgr; TiO2 + ZrO2 3.0-6.0 P2O5 0-8.0 Fe2O3 <200 ppm F 0-0.

Abstract: The invention relates to a glass powder, where at least one oxidizing agent or one reducing agent is added to the glass powder. The glass powder is preferably used as dental glass powder.

Abstract: An improved filling material for a composite solder glass based on doped PbTiO3 is disclosed, in which up to 35 atom % of the Pb atoms and up to 35% Ti atoms are replaced by Mg and/or Ca and a portion of O atoms in the doped PbTiO3 is replaced with halogen atoms, preferably fluorine atoms. This filling material and composite solder glasses containing it are useful for hermetic sealing, soldering and/or coating of individual components made of glass material, glass-ceramic material, ceramic material and metal in the manufacturing of components and devices for electrical engineering and electronics, for hermetic encapsulation of electronic components, vacuum-tight seals or closures of display tubes or for display devices. They are also useful for coating and bonding of special glasses. The filling material can be made by reaction sintering of a powder mixture at temperatures of 800° C. to 1250° C.