Transparent ion-exchangeable silicate glasses with high fracture toughness
Provided herein are glass based articles comprising SiO 2 in a range from about 20 mol % to about 80 mol %; Al 2 O 3 in a range from about 2 mol % to about 60 mol %; MgO; Li 2 O; La 2 O 3 in an amount greater than or equal to about 3 mol %; a sum of alkali metal oxides (R 2 O) is greater than or equal to about 6 mol %; and a sum of MgO and Al 2 O 3 is greater than or equal to about 28 mol %, wherein the glass based article is free of B 2 O 3.
1. A glass based article comprising:
SiO 2 in a range from 20 mol % to 63 mol %;
Al 2 O 3 in a range from 15 mol % to 60 mol %;
MgO;
Li 2 O;
La 2 O 3 in an amount greater than or equal to 3 mol %;
a sum of alkali metal oxides (R 2 O) is greater than or equal to 6 mol %; and
a sum of MgO and Al 2 O 3 is greater than or equal to 28 mol %,
wherein the glass based article is free of B 2 O 3 .
2. The glass based article of claim 1 , wherein MgO is in a range from 1 mol % to 42 mol %.
3. The glass based article of claim 1 , wherein the sum of R 2 O is in a range from 6 mol % to 15 mol %.
4. The glass based article of claim 1 , wherein La 2 O 3 is in a range from 5 mol % to 15 mol %.
5. The glass based article of claim 4 , wherein MgO is in a range from 3 mol % to 32 mol %.
6. The glass based article of claim 1 , wherein La 2 O 3 is in a range from 3 mol % to 18 mol %.
7. The glass based article of claim 6 , wherein MgO is in a range from 2 mol % to 37 mol %.
8. The glass based article of claim 1 , comprising:
MgO in the range of 1 mol % to 12 mol %;
La 2 O 3 in the range of 3 mol % to 18 mol %; and
the sum of R 2 O is in a range from 6 mol % to 15 mol %.
9. The glass based article of claim 8 , comprising:
SiO 2 in the range of 25 mol % to 63 mol %; and
Al 2 O 3 in the range of 15 mol % to 50 mol %.
10. The glass based article of claim 9 , comprising:
SiO 2 in the range of 30 mol % to 63 mol %; and
Al 2 O 3 in the range of 15 mol % to 40 mol %.
11. The glass based article of claim 1 , comprising:
SiO 2 in the range of 25 mol % to 63 mol %;
Al 2 O 3 in the range of 15 mol % to 50 mol %;
MgO in the range of 2 mol % to 37 mol %;
La 2 O 3 in the range of 3 mol % to 18 mol %; and
the sum of R 2 O is in a range from 6 mol % to 15 mol %.
12. The glass base article of claim 1 , comprising:
SiO 2 in the range of 30 mol % to 63 mol %;
Al 2 O 3 in the range of 15 mol % to 40 mol %;
MgO in the range of 3 mol % to 32 mol %;
La 2 O 3 in the range of 5 mol % to 15 mol %; and
the sum of R 2 O is in a range from 6 mol % to 15 mol %.
13. The glass based article of claim 1 , wherein (i) a fracture toughness is at least 0.8 MPa*m 0.5 , (ii) a Young's modulus value is at least 90 GPa; and/or (iii) a stress optical coefficient (SOC) is not more than 3 Brewster.
14. A consumer electronic product, comprising:
a housing comprising a front surface, a back surface and side surfaces;
electrical components at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display at or adjacent the front surface of the housing; and
a cover substrate disposed over the display,
wherein at least one of a portion of the housing or the cover substrate comprises the glass based article of claim 1 .