| abstract |
The purpose of the present invention is to provide a glass with high fracture toughness value and easy to manufacture, and a chemically strengthened glass with high strength and not prone to severe breakage. The present invention relates to a glass with a fracture toughness value of 0.85 MPa·m 1/2 or more and a specific composition; when expressed in molar percentage based on oxides, it contains specific amounts of SiO 2 , Al 2 O 3 , and Li 2 O, the content of SiO 2 is set to [SiO 2 ], the content of Al 2 O 3 is set to [Al 2 O 3 ], (2×[Al 2 O 3 ]-X)/[SiO 2 ] is a specific range The glass; and a chemically strengthened glass with a compressive stress value (CS 50 ) of 150 MPa or more at a depth of 50 μm from the glass surface and a specific composition. |