Glass ceramic composition
A glass ceramic composition that contains a first ceramic including at least one of MgAl 2 O 4 and Mg 2 SiO 4 ; a second ceramic including BaO, RE 2 O 3 (RE is a rare-earth element), and TiO 2 ; glass containing each of 44.0 to 69.0 weight % of RO (R is an alkaline-earth metal), 14.2 to 30.0 weight % of SiO 2 , 10.0 to 20.0 weight % of B 2 O 3 , 0.5 to 4.0 weight % of Al 2 O 3 , 0.3 to 7.5 weight % of Li 2 O, and 0.1 to 5.5 weight % of MgO; and MnO.
1. A glass ceramic composition comprising:
(1) a first ceramic comprising at least one of MgAl 2 O 4 and Mg 2 SiO 4 ;
(2) a second ceramic comprising BaO, RE 2 O 3 , and TiO 2 ;
(3) glass containing each of 44.0 to 69.0 weight % of RO, 14.2 to 30.0 weight % of SiO 2 , 10.0 to 20.0 weight % of B 2 O 3 , 0.5 to 4.0 weight % of Al 2 O 3 , 0.3 to 7.5 weight % of Li 2 O, and 0.1 to 5.5 weight % of MgO; and
(4) MnO,
wherein RE is a rare-earth element, and R is at least one alkaline-earth metal selected from Ba, Ca, and Sr.
2. The glass ceramic composition according to claim 1 , comprising:
47.55 to 69.32 weight % of the first ceramic,
6 to 20 weight % of the glass,
7.5 to 18.5 weight % of the MnO, and
as the second ceramic, each of 0.38 to 1.43 weight % of BaO, 1.33 to 9.5 weight % of RE 2 O 3 , and 0.95 to 6.75 weight % of TiO 2 .
3. The glass ceramic composition according to claim 2 , further comprising 0.23 weight % or less of CuO.
4. The glass ceramic composition according to claim 2 , further comprising a third ceramic comprising at least one of Mg 2 Al 4 Si 5 O 18 and BaAl 2 Si 2 O 8 at 3 to 20 weight %.
5. The glass ceramic composition according to claim 4 , further comprising 0.3 weight % or less of CuO.
6. The glass ceramic composition according to claim 2 , further comprising a third ceramic comprising at least one of Mg 2 Al 4 Si 5 O 18 and BaAl 2 Si 2 O 8 .
7. The glass ceramic composition according to claim 6 , further comprising 0.3 weight % or less of CuO.
8. The glass ceramic composition according to claim 1 , comprising:
1 to 15 weight % of the first ceramic,
3 to 15 weight % of the glass,
2.3 to 10 weight % of the MnO, and
as the second ceramic, each of 2.5 to 15.7 weight % of BaO, 24.6 to 65.3 weight % of RE 2 O 3 , and 11.2 to 36.4 weight % of TiO 2 .
9. The glass ceramic composition according to claim 8 , further comprising 1.2 weight % or less of CuO.
10. The glass ceramic composition according to claim 1 , comprising:
15.5 to 47 weight % of the first ceramic,
7 to 20 weight % of the glass,
5.5 to 20.5 weight % of the MnO, and
as the second ceramic, each of 2.1 to 5.2 weight % of BaO, 13.2 to 34.75 weight % of RE 2 O 3 , and 9.5 to 24.75 weight % of TiO 2 .
11. The glass ceramic composition according to claim 10 , further comprising 1.2 weight % or less of CuO.
12. The glass ceramic composition according to claim 11 , further comprising a third ceramic comprising at least one of Mg 2 Al 4 Si 5 O 18 and BaAl 2 Si 2 O 8 at 7.5 weight % or less.
13. The glass ceramic composition according to claim 10 , further comprising a third ceramic comprising at least one of Mg 2 Al 4 Si 5 O 18 and BaAl 2 Si 2 O 8 at 7.5 weight % or less.
14. The glass ceramic composition according to claim 10 , further comprising a third ceramic comprising at least one of Mg 2 Al 4 Si 5 O 18 and BaAl 2 Si 2 O 8 .