Claims
- 1. A method of dissolving at least 30% by weight of forsterite component in a glass-ceramic, the method comprising:providing a R2O—MgO—Al2O3—SiO2 glass composition, wherein R is an alkali ion, containing, in weight percent, at least about 3% of Na2O coupled with greater than 5% of TiO2; melting said glass at a temperature between about 1575° C. to about 1650° C.
- 2. The method according to claim 1, wherein said glass has a composition, in weight percent on an oxide basis, consisting essentially of about: 40-60% SiO2; 10-25% Al2O3; 18-30% MgO; 3-10% Na2O; 0-10% K2O; >5-15% TiO2.
- 3. The method according to claim 1, further comprising achieving at least 30% by weight of forsterite component in said glass-ceramic at a liquidus temperature of said glass composition of about 1525° C. or below.
- 4. The method according to claim 2, wherein Na2O and K2O are both present in about a 1:1 molar ratio.
- 5. The method according to claim 2, wherein said TiO2 content by weight in said composition is greater than about 6%, and less than about 9%.
- 6. The method according to claim 2, wherein said composition further includes, in weight percent on an oxide basis, up to about 1.3% chromium oxide.
- 7. The method according to claim 6, wherein said composition includes, in weight percent on an oxide basis, about 0.05% to about 0.7% chromium oxide.
- 8. The method according to claim 2, wherein said composition further includes, in weight percent on an oxide basis, up to about 20% GeO2.
- 9. The method according to claim 2, wherein said composition includes a transition metal ion selected from the group consisting of Ni2+, V3+, Co2+, Cr4+, Cu2+, Cu3+, Mn2+, Fe2+, and Ti3+.
- 10. The method according to claim 2, wherein said crystallinity of said glass-ceramic is about 35% or more by weight of forsterite components.
- 11. The method according to claim 2, wherein crystals in crystal phase of said glass-ceramic have a size no larger than about 60 nm.
- 12. The method according to claim 2 wherein crystals in crystal phase of said glass-ceramic have a size between about 10 nm to about 35 nm.
RELATED APPLICATIONS
This application is a divisional of application Ser. No. 09/929,549 filed Aug. 14, 2001, now U.S. Pat. No. 6,660,669 and the benefit of priority pursuant to 35 U.S.C. §120 is hereby claimed.
U.S. patent application Ser. No. 09/686,418, entitled TRANSPARENT FORSTERITE GLASS-CERAMICS, filed on Oct. 11, 2000, in the name of George H. Beall, claiming priority to U.S. Provisional Application No. 60/174,012 filed on Oct. 18, 1999.
U.S. patent application Ser. No. 09/686,564, entitled TRANSITION-METAL GLASS-CERAMIC GAIN MEDIA, filed on Oct. 11, 2000, in the name of George H. Beall, Nicholas F. Borrelli, Eric J. Mozdy, and Linda R. Pinckney, claiming priority to U.S. Provisional Application No. 60/160,053 filed on Oct. 18, 1999.
US Referenced Citations (18)
Foreign Referenced Citations (2)
Number |
Date |
Country |
01-308843 |
Dec 1989 |
JP |
0128945 |
Apr 2001 |
WO |
Non-Patent Literature Citations (2)
Entry |
T. Murata et al., “Compositional Dependence Of The Valency State of Cr Ions In Oxide Glasses”, Journal of Non-Crystalline Solids 220 (1997), pp. 139-146. |
G.H. Beall, “Glass-Ceramics For Photonic Applications”, Int. Symp. On Crystallization In Glasses & Liquids, Glastech. Ber. Glass Sci. Technol. 73 C1 (2000), pp. 3-11. |
Provisional Applications (1)
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Number |
Date |
Country |
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60/160053 |
Oct 1999 |
US |