In embodiments, a glass-ceramic article includes from about 55 wt. % to about 80 wt. % SiO.sub.2; from about 2 wt. % to about 20 wt. % Al.sub.2O.sub.3; from about 5 wt. % to about 20 wt. % Li.sub.2O; a non-zero amount of P.sub.2O.sub.5 less than or equal to 6 wt. %; and from about 3 wt. % to less than 8 wt. % ZrO.sub.2. The glass-ceramic grains having a longest dimension of less than 100 nm.

Disclosed herein are glass-ceramic compositions, articles made from the disclosed glass-ceramic compositions, and methods of making the same. More specifically disclosed herein is a glass-ceramic composition comprising: a) from about 2 mol % to about 20 mol % of Al.sub.2O.sub.3; b) from about 2 mol % to about 45 mol % of Li.sub.2O; and c) from about 48 mol % to about 80 mol % of SiO.sub.2; having a β-spodumene phase and a lithium silicate crystalline phase, and optionally a petalite phase.

The glass ceramic material of the present disclosure contains a glass that contains SiO.sub.2, B.sub.2O.sub.3, Al.sub.2O.sub.3, and M.sub.2O, where M is an alkali metal, and a filler that contains quartz, Al.sub.2O.sub.3, and ZrO.sub.2. The glass ceramic material contains the glass in an amount of 57.4% by weight or more and 67.4% by weight or less, the quartz in the filler in an amount of 29% by weight or more and 39% by weight or less, the Al.sub.2O.sub.3 in the filler in an amount of 1.8% by weight or more and 5% by weight or less, and the ZrO.sub.2 in the filler in an amount of 0.3% by weight or more and 1.8% by weight or less.

A composition includes: 30 mol % to 60 mol % SiO.sub.2; 15 mol % to 35 mol % Al.sub.2O.sub.3; 5 mol % to 25 mol % Y.sub.2O.sub.3; 0 mol % to 20 mol % TiO.sub.2; and 0 mol % to 25 mol % R.sub.2O, such that R.sub.2O is the sum of Na.sub.2O, K.sub.2O, Li.sub.2O, Rb.sub.2O, and Cs.sub.2O.

Glass-based articles are provided that exhibit improved fracture resistance. The relationships between properties attributable to the glass composition and stress profile of the glass-based articles are provided that indicate improved fracture resistance.

Devices, apparatuses, and methods are disclosed that include a glass or glass ceramic substrate with a bleached region and an unbleached region. Examples include a substrate with a region that transmits IR wavelength light, and a region that is substantially opaque to IR light. Examples include additional opacity in some or all regions to visible wavelength light and/or UV wavelength light.

A glass-based article includes an amorphous phase and a crystalline phase, and a first surface and a second surface opposing the first surface thereby defining a thickness (t) of the glass-based article. The glass-based article has a stress profile with a surface compressive stress (CS) and a maximum central tension (CT). The maximum CT is greater than or equal to 80 MPa and less than or equal to 95 MPa, and the maximum CT is positioned within the glass-based article at a range from greater than or equal to 0.4.Math.t and less than or equal to 0.6.Math.t. The surface CS of the glass-based article is greater than or equal to 200 MPa; and a depth of compression (DOC) is from greater than or equal to 0.14.Math.t and less than or equal to 0.25.Math.t.

A glass-based article may include from about 45 mol. % to about 80 mol. % SiO.sub.2; from about 0 mol. % to about 10 mol. % Na.sub.2O; less than about 5 mol. % K.sub.2O; a non-zero amount of Al.sub.2O; and an amorphous phase and a crystalline phase. The article may further in include a stress profile comprising a surface compressive stress (CS) and a maximum central tension (CT). A ratio of Li.sub.2O (mol. %) to R.sub.2O (mol. %) in the article is from about 0.5 to about 1, where R.sub.2O is the sum of Li.sub.2O, Na.sub.2O, and K.sub.2O in the article. CT may be greater than or equal to about 50 MPa and less than about 100 MPa. CS may be greater than 2.0.Math.CT. A depth of compression (DOC) of the stress profile may be greater than or equal to 0.14.Math.t and less than or equal to 0.25.Math.t, where t is the thickness of the article.

The present invention relates to a glass ceramic having a visible-light transmittance of 85% or more in terms of a thickness of 0.7 mm, and a haze value of 1.0% or less in terms of a thickness of 0.7 mm, and including, in mass % on an oxide basis: 45-70% of SiO.sub.2; 1-15% of Al.sub.2O.sub.3; and 10-25% of Li.sub.2O.

The present invention relates to a glass ceramic having a three-dimensional shape including plural R-shapes including a smallest R-shape whose average radius of curvature is 5.0×10.sup.2 mm or less and a largest R-shape whose average radius of curvature is 1.0×10.sup.3 mm or more, having a maximum value of retardations of 20 nm/mm or less, and having a haze value converted into a value corresponding to a thickness of 0.8 mm of 1.0% or less in the largest R-shape.