Back to results
US 12,692,187 B2Granted
High-index high-dispersion phosphate glasses containing bismuth oxide
AssigneeCorning Incorporated
InventorsBruce Gardiner Aitken, Jian Luo, Lina Ma, Alexander I Priven
Life of this patent
Estimating the term…
Abstract
Glass compositions include phosphorus oxide (P2O5), niobia (Nb2O5), titania (TiO2) and bismuth oxide (Bi2O3) as essential components and may optionally include barium oxide (BaO), calcium oxide (CaO), potassium oxide (K2O), lithium oxide (Li2O), sodium oxide (Na2O), tungsten oxide (WO3), boron oxide (B2O3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.
Claims20
A glass comprising a plurality of components, the glass having a composition of the components comprising:
- greater than or equal to 15.9 mol. % and less than or equal to 50.0 mol. % P2O5,
- greater than or equal to 4.5 mol. % and less than or equal to 50.0 mol. % Bi2O3,
- greater than or equal to 0.0 mol. % and less than or equal to 50.0 mol. % TiO2,
- greater than or equal to 0.0 mol. % and less than or equal to 50.0 mol. % Nb2O5,
- greater than or equal to 0.0 mol. % and less than or equal to 25.0 mol. % Li2O,
- greater than or equal to 0.0 mol. % and less than or equal to 25.0 mol. % K2O,
- greater than or equal to 0.0 mol. % and less than or equal to 20.0 mol. % Na2O,
- greater than or equal to 0.0 mol. % and less than or equal to 6.0 mol. % WO3,
- greater than or equal to 0.0 mol. % and less than or equal to 1.0 mol. % V2O5,
- a sum of TiO2+Nb2O5 greater than or equal to 25.0 mol. % and less than or equal to 70.0 mol. %,
- a sum of Alk2O greater than or equal to 0.5 mol. % and less than or equal to 30.0 mol. %,
- a sum of RO greater than or equal to 0.5 mol. % and less than or equal to 30.0 mol. %,
- a sum of GeO2+TeO2 greater than or equal to 0.0 mol. % and less than or equal to 25.0 mol. % and
- optionally comprising Al2O3,
- wherein the composition of the components satisfies the condition:
- Alk2O+RO+Bi2O3+3*Al2O3—P2O5[mol. %]≥−8.0
- where Alk2O is a total sum of alkali metal oxides and RO is a total sum of divalent metal oxides, an asterisk (*) means multiplication, and
- wherein none of the ranges of the components is modified by the term “about”.
15 more elements
A glass comprising a plurality of components, the glass having a composition of the components comprising:
- greater than or equal to 23.0 mol. % and less than or equal to 35.0 mol. % P2O5,
- greater than or equal to 4.5 mol. % and less than or equal to 35.0 mol. % Bi2O3,
- greater than or equal to 0.5 mol. % and less than or equal to 55.0 mol. % Nb2O5,
- greater than or equal to 0.5 mol. % and less than or equal to 55.0 mol. % TiO2,
- greater than or equal to 0.3 mol. % and less than or equal to 20.0 mol. % Li2O and
- optionally comprising one or more components selected from BaO, K2O, CaO, Na2O, SrO, WO3, B2O3, SiO2, ZnO, ZrO2, MgO, Al2O3, TeO2, PbO, GeO2, Tl2O, Ag2O, CdO, Cs2O, Ga2O3, La2O3, MoO3, Ta2O5 and V2O5,
- wherein none of the ranges of the components is modified by the term “about”,
- wherein the glass satisfies the condition:
- Pn−(1.14+0.192*Pa)>0.000,
- where
- Pn is a refractive index at 587.56 nm, nd, calculated from the glass composition in terms of mol. % of the components according to the Formula (I):
- Pn=1.865−0.0052736*P2O5+0.0071201*Nb2O5+0.0031659*TiO2−0.0008032*BaO−0.0047736*K2O−0.00076807*CaO−0.0027991*Na2O−0.0016514*Li2O−0.00069646*SrO+0.0032628*WO3+0.007519*Bi2O3−0.0040698*B2O3−0.0035951*SiO2−0.00067102*ZnO+0.0022313*ZrO2−0.0019531*MgO−0.003506*Al2O3+0.0019216*TeO2+0.0025766*PbO−0.0018844*GeO2+0.0065444*Tl2O+0.0052048*Ag2O, (I)
- and Pd is a parameter predicting a density at room temperature, dRT, calculated from the glass composition in terms of mol. % of the components according to the Formula (II):
- Pd=4.45−0.020780*Al2O3−0.020918*B2O3+0.014152*BaO+0.061008*Bi2O3−0.0067411*CaO+0.013529*CdO+0.012560*Cs2O+0.0028892*Ga2O3−0.0057012*GeO2−0.017838*K2O+0.046524*La2O3−0.013919*Li2O−0.010279*MgO−0.0064231*MoO3−0.012983*Na2O+0.0083294*Nb2O5−0.028926*P2O5+0.031742*PbO−0.019022*SiO2+0.0045214*SrO+0.050158*Ta2O5+0.0088486*TeO2−0.0063053*TiO2−0.018941*V2O5+0.027483*WO3−0.0010277*ZnO+0.0100487*ZrO2, (II)
- where an asterisk (*) means multiplication and neither of the parameters Pn and Pais modified by the term “about”.
12 more elements
Dependencies are inferred from the claim text.