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Provided is a glass substrate satisfying ion exchange performance and devitrification resistance of a glass simultaneously and having higher mechanical strength compared to a conventional glass substrate. A tempered glass substrate which has a compression stress layer on a surface thereof, has a gla

Provided is a glass substrate satisfying ion exchange performance and devitrification resistance of a glass simultaneously and having higher mechanical strength compared to a conventional glass substrate. A tempered glass substrate which has a compression stress layer on a surface thereof, has a glass composition including, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O, 0 to 20% of Na2O, 0 to 20% of K2O, 0.001 to 10% of TiO2, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, and is substantially free of As2O3 and F.

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1. A tempered glass substrate, comprising a compression stress layer on a plane surface thereof, wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2

1. A tempered glass substrate, comprising a compression stress layer on a plane surface thereof, wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As2O3 and F. 2. The tempered glass substrate according to claim 1, wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 12.5% of Al2O3, 0 to 7% of B2O3, 0 to 9% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 8% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 2.7 in terms of mole fraction, a (MgO+CaO)/Al2O3 value of 0 to 0.55 in terms of mole fraction, a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As2O3 and F. 3. The tempered glass substrate according to claim 1, wherein a compression stress of the plane surface is 100 MPa or more and a depth of the compression stress layer is 1 μm or more. 4. The tempered glass substrate according to claim 1, wherein the plane surface is an unpolished surface. 5. The tempered glass substrate according to claim 1, wherein the tempered glass substrate is formed by an overflow down-draw method. 6. The tempered glass substrate according to claim 1, wherein the tempered glass substrate has a liquidus temperature of 1300° C. or lower. 7. The tempered glass substrate according to claim 1, wherein the tempered glass substrate has a liquidus viscosity of 104.0 dPa·s or more. 8. The tempered glass substrate according to claim 1, wherein the tempered glass substrate is cut after forming the compression stress layer by an ion exchange. 9. The tempered glass substrate according to claim 1, wherein the tempered glass substrate has a liquidus viscosity of 105.0 dPa·s or more. 10. The tempered glass substrate according to claim 1, wherein the tempered glass has a thermal expansion coefficient at 30 to 380° C. of 40 to 95×10−7/° C. 11. The tempered glass substrate according to claim 1, wherein the tempered glass has a crack generation ratio of 60% or less. 12. The tempered glass substrate according to claim 1, which is used as a touch panel display. 13. A tempered glass substrate, comprising a compression stress layer on a plane surface thereof, wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 7% of B2O3, 0.5 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, and has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, and a K2O /(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction. 14. The tempered glass substrate according to claim 13, wherein the tempered glass substrate has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 12.5% of Al2O3, 0 to 7% of B2O3, 0.5 to 10% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.01 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 28.5% of Li2O+Na2O+K2O+Al2O3, and has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 2.7 in terms of mole fraction, and a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction. 15. The tempered glass substrate according to claim 13, wherein a compression stress of the surface is 100 MPa or more and a depth of the compression stress layer is 1 μm or more. 16. The tempered glass substrate according to claim 13, wherein the plane surface is an unpolished surface. 17. The tempered glass substrate according to claim 13, wherein the tempered glass substrate is formed by an overflow down-draw method. 18. The tempered glass substrate according to claim 13, wherein the tempered glass substrate has a liquidus temperature of 1300° C. or lower. 19. The tempered glass substrate according to claim 13, wherein the tempered glass substrate has a liquidus viscosity of 104.0 dPa·s or more. 20. The tempered glass substrate according to claim 13, wherein the tempered glass substrate is cut after forming the compression stress layer by an ion exchange. 21. The tempered glass substrate according to claim 13, wherein the tempered glass substrate has a liquidus viscosity of 105.0 dPa·s or more. 22. The tempered glass substrate according to claim 13, wherein the tempered glass has a thermal expansion coefficient at 30 to 380° C. of 40 to 95×10−7/° C. 23. The tempered glass substrate according to claim 13, wherein the tempered glass has a crack generation ratio of 60% or less. 24. The tempered glass substrate according to claim 13, which is used as a touch panel display. 25. A tempered glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction, is substantially free of As2O3 and F, and has a compression stress layer formed on a plane surface. 26. A tempered glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 7% of B2O3, 0.5 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction, and has a compression stress layer formed on a plane surface. 27. A glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction, a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction, and is substantially free of As2O3 and F. 28. A glass according to claim 27, which has, when ion exchange is carried out in a KNO3 molten salt at 430° C. for 4 hours, a compression stress of a surface of 200 MPa or more and a depth of compression stress layer of 3 μm or more. 29. A glass, which has a glass composition comprising, in terms of mole %, 50 to 85% of SiO2, 5 to 30% of Al2O3, 0 to 7% of B2O3, 0.5 to 20% of Li2O, 7 to 20% of Na2O, 0 to 4% of K2O, 0.001 to 10% of TiO2, 0 to 0.1% of ZrO2, 0 to 1% of CaO, and 15 to 35% of Li2O+Na2O+K2O+Al2O3, and has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7 to 3 in terms of mole fraction and a K2O/(Li2O+Na2O+K2O) value of 0 to 0.11 in terms of mole fraction. 30. The glass according to claim 29, wherein when an ion exchange is carried out in a KNO3 molten salt at 430° C. for 4 hours, the glass has a compression stress of the compression stress layer of 200 MPa or more and a depth of the compression stress layer of 3 μm or more.