The disclosure relates to a glass and a melt solder for the passivation of semiconductor components, the use of the glass or the melt solder for the passivation of semiconductor components, a passivated semiconductor component and a method for passivating semiconductor components.

To provide an optical glass having a high refractive index and a relatively low specific gravity, and an optical element.

An optical glass which is a SiO.sub.2—TiO.sub.2—Nb.sub.2O.sub.5-based glass, and in which the content of SiO.sub.2 is 10% by mass or greater, the total content of Na.sub.2O, K.sub.2O, and Cs.sub.2O(Na.sub.2O+K.sub.2O+Cs.sub.2O) is 11.0% by mass or less, and the specific gravity and the refractive index nd thereof satisfy formula (1).

nd≥0.2×specific gravity+1.18  (1):

To provide an optical glass having a high refractive index and a relatively low specific gravity, and an optical element.

An optical glass which is a SiO.sub.2—TiO.sub.2—Nb.sub.2O.sub.5-based glass, and in which the content of SiO.sub.2 is 10% by mass or greater, the total content of Na.sub.2O, K.sub.2O, and Cs.sub.2O(Na.sub.2O+K.sub.2O+Cs.sub.2O) is 11.0% by mass or less, and the specific gravity and the refractive index nd thereof satisfy formula (1).

nd≥0.2×specific gravity+1.18  (1):

Glass compositions include titania (TiO.sub.2), lanthanum oxide (La.sub.2O.sub.3), boron oxide (B.sub.2O.sub.3), silica (SiO.sub.2) as essential components and may optionally include zirconia (ZrO.sub.2), niobia (Nb.sub.2O.sub.5), calcium oxide (CaO), barium oxide (BaO), yttria (Y.sub.2O.sub.3), zinc oxide (ZnO), gadolinium oxide (Gd.sub.2O.sub.3), gallia (Ga.sub.2O.sub.3), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include titania (TiO.sub.2), lanthanum oxide (La.sub.2O.sub.3), boron oxide (B.sub.2O.sub.3), silica (SiO.sub.2) as essential components and may optionally include zirconia (ZrO.sub.2), niobia (Nb.sub.2O.sub.5), calcium oxide (CaO), barium oxide (BaO), yttria (Y.sub.2O.sub.3), zinc oxide (ZnO), gadolinium oxide (Gd.sub.2O.sub.3), gallia (Ga.sub.2O.sub.3), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

A glass sheet of the present invention is characterized in that: the glass sheet has a refractive index nd of from 1.55 to 2.30; the glass sheet has an inclined surface in at least a part of an end surface; an angle formed by the inclined surface and a principal surface is from 5° to 85°; and the inclined surface has a surface roughness Ra of 1 μm or less.

A composition for enamel may include 20 to 45 wt % of SiO.sub.2; 1 to 15 wt % of B.sub.2O.sub.3, 10 to 20 wt % of one or more of Na.sub.2O, K.sub.2O, and Li.sub.2O, 1 to 5 wt % of NaF, 1 to 10 wt % of ZnO, 5 to 15 wt % of TiO.sub.2, 3 to 7 wt % of MoO.sub.3; 5 to 15 wt % of Bi.sub.2O.sub.3, 1 to 5 wt % of CeO.sub.2, and 1 to 10 wt % of one or more of MnO.sub.2, Fe.sub.2O.sub.3, and Co.sub.3O.sub.4. The composition may be used to coat a cooking appliance for easy removal of contaminants at room temperature.

A composition includes 30 mol % to 60 mol % SiO.sub.2; 15 mol % to 40 mol % Al.sub.2O.sub.3; 5 mol % to 25 mol % Y.sub.2O.sub.3; 5 mol % to 15 mol % TiO.sub.2; and 0.1 mol % to 15 mol % RO, such that RO is a sum of MgO, CaO, SrO, and BaO.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the glass contains silicon, boron, and magnesium.

A glass ceramic seal is formed from a precursor material that includes from 80 mol % to 100 mol % of a primary component containing, on an oxide basis, from 25 mol % to 55 mol % SiO.sub.2, from 20 mol % to 45 mol % CaO, from 5 mol % to 30 mol % MgO, and from 0 mol % to 15 mol % Al.sub.2O.sub.3.