Glass and glass-ceramic compositions
A composition includes: 30 mol % to 60 mol % SiO 2 ; 15 mol % to 35 mol % Al 2 O 3 ; 5 mol % to 25 mol % Y 2 O 3 ; 0 mol % to 20 mol % TiO 2 ; and 0 mol % to 25 mol % R 2 O, such that R 2 O is the sum of Na 2 O, K 2 O, Li 2 O, Rb 2 O, and Cs 2 O.
1. A glass-ceramic having a Young's modulus in a range of 119 GPa to 177 GPa, comprising homogenous and internally nucleated crystalline microstructures, the glass-ceramic having a composition, comprising:
30 mol % to 40 mol % SiO 2 ;
25 mol % to 35 mol % Al 2 O 3 ;
8 mol % to 14 mol % Y 2 O 3 ;
4 mol % to 18 mol % TiO 2 ; and
5 mol % to 25 mol % R 2 O,
wherein R 2 O is the sum of Na 2 O, K 2 O, Li 2 O, Rb 2 O, and Cs 2 O.
2. The glass-ceramic of claim 1 , wherein R 2 O consists of Na 2 O or Li 2 O.
3. The glass-ceramic of claim 1 , wherein R 2 O comprises 0 mol % to 12.5 mol % Na 2 O.
4. The glass-ceramic of claim 1 , wherein R 2 O comprises 0 mol % to 12.5 mol % Li 2 O.
5. The glass-ceramic of claim 1 , further comprising 0 mol % to 2.5 mol % B 2 O 3 .
6. The glass-ceramic of claim 1 , further comprising 0 mol % to 4 mol % ZrO 2 .
7. The glass-ceramic of claim 1 , comprising:
0 mol % to 12.5 mol % Li 2 O;
0 mol % to 10.5 mol % Na 2 O; and
0 mol % to 2.5 mol % B 2 O 3 .
8. The glass-ceramic of claim 1 , comprising:
0 mol % to 11.5 mol % Li 2 O;
0 mol % to 10.5 mol % Na 2 O; and
0 mol % to 4 mol % ZrO 2 .