The invention relates to a radiopaque glass having a refractive index n.sub.d of 1.480 to 1.561, this glass, apart from impurities at most, being free from SrO and PbO. The glass is based on the SiO.sub.2, Al.sub.2O.sub.3 and B.sub.2O.sub.3 system. The radiopacity can be adjusted using Cs.sub.2O in particular in combination with BaO and/or SnO.sub.2 optionally in conjunction with fluorine. The glass may be used in particular as dental glass or as optical glass.

A glass material that includes: from about 0.45 to about 0.86 mole fraction of SiO.sub.2; from about 0.05 to about 0.43 mole fraction of: Y.sub.2O.sub.3, BaO, or a combination of Y.sub.2O.sub.3 and BaO; and optionally Ta.sub.2O.sub.5. The sum of the Y.sub.2O.sub.3, the BaO and the optional Ta.sub.2O.sub.5 is from about 0.10 to about 0.50 mole fraction. The glass includes less than 0.01 mole fraction of Na.sub.2O and less than 0.01 mole fraction of K.sub.2O. The glass material may be in the form of microspheres. The microspheres may be used for vascular embolization and/or radiologic imaging.

Embodiments of the present disclosure are directed to methods for inducing color change in glass and glass-ceramic articles. According to one embodiment, color change may be x-ray induced in glass or glass-ceramic articles. The method for x-ray inducing color change may include exposing the glass or glass-ceramic article to x-rays at a temperature of up to 200 C. to induce a colored area in the glass or glass-ceramic article. The glass or glass-ceramic article may comprise: 50-85 mole % SiO.sub.2; 5-25 mole % Al.sub.2O.sub.3; 0-15 mole % P.sub.2O.sub.5; 0-15 mole % B.sub.2O.sub.3; 5-25 mole % R.sub.2O, wherein R.sub.2OLi.sub.2O+Na.sub.2O+K.sub.2O.

A glass composition contains cesium (Cs), at least one of potassium (K) or sodium (Na), and silicon (Si), wherein a content of the cesium (Cs) in terms of oxide is 9% by mass or more, wherein when the potassium (K) is contained in the glass composition, a content of the potassium (K) in terms of oxide is 5% by mass or more, wherein when the sodium (Na) is contained in the glass composition, a content of the sodium (Na) in terms of oxide is 1% by mass or more, and wherein the glass composition does not contain barium (Ba) or contains 0.5% by mass or less of barium (Ba) in terms of oxide.

The invention relates to a radiopaque glass having a refractive index n.sub.d of 1.480 to 1.561, this glass, apart from impurities at most, being free from SrO and PbO. The glass is based on the SiO.sub.2, Al.sub.2O.sub.3 and B.sub.2O.sub.3 system. The radiopacity can be adjusted using Cs.sub.2O in particular in combination with BaO and/or SnO.sub.2 optionally in conjunction with fluorine. The glass may be used in particular as dental glass or as optical glass.

The amorphous, or at least partially crystalline, glass-based joining material is suitable for high-temperature applications, particularly in fuel cells and/or sensors. In addition to SiO.sub.2 and B.sub.2O.sub.3 as glass formers, the joining material similarly contains BaO and CaO, whereby the amount of Al.sub.2O.sub.3 is limited. The joining material has a coefficient of linear thermal expansion of at least 7.0.Math.10.sup.6 K.sup.1 in a range of 20 C. to 300 C. The joining material can be used for joining ferritic high-grade steels and/or chromium-containing alloys and/or ceramics, such as stabilized zirconium oxide and/or aluminium oxide.

Embodiments of the present disclosure are directed to methods for inducing color change in glass and glass-ceramic articles. According to one embodiment, color change may be x-ray induced in glass or glass-ceramic articles. The method for x-ray inducing color change may include exposing the glass or glass-ceramic article to x-rays at a temperature of up to 200 C. to induce a colored area in the glass or glass-ceramic article. The glass or glass-ceramic article may comprise: 50-85 mole % SiO.sub.2; 5-25 mole % Al.sub.2O.sub.3; 0-15 mole % P.sub.2O.sub.5; 0-15 mole % B.sub.2O.sub.3; 5-25 mole % R.sub.2O, wherein R.sub.2O=Li.sub.2O+Na.sub.2O+K.sub.2O.

Embodiments of the present disclosure are directed to methods for inducing color change in glass and glass-ceramic articles. According to one embodiment, color change may be x-ray induced in glass or glass-ceramic articles. The method for x-ray inducing color change may include exposing the glass or glass-ceramic article to x-rays at a temperature of up to 200 C. to induce a colored area in the glass or glass-ceramic article. The glass or glass-ceramic article may comprise: 50-85 mole % SiO.sub.2; 5-25 mole % Al.sub.2O.sub.3; 0-15 mole % P.sub.2O.sub.5; 0-15 mole % B.sub.2O.sub.3; 5-25 mole % R.sub.2O, wherein R.sub.2O=Li.sub.2O+Na.sub.2O+K.sub.2O.

In a method of making pixelated scintillators, an amorphous scintillator material in a molten state is pressed into a plurality of cavities defined by a plurality of walls of a mesh array. The molten scintillator material in the plurality of cavities is cooled to form a pixelated scintillator array. An x-ray imager including a pixelated scintillator is also described.

In a method of making pixelated scintillators, an amorphous scintillator material in a molten state is pressed into a plurality of cavities defined by a plurality of walls of a mesh array. The molten scintillator material in the plurality of cavities is cooled to form a pixelated scintillator array. An x-ray imager including a pixelated scintillator is also described.