Bismuth oxide glasses containing germanium oxide
View Patent ↗The invention relates to bismuth oxide glass, containing germanium oxide, a method for the production thereof, the use thereof and a glass fiber consisting of said inventive glass.
1. A process for producing a bismuth-containing glass, in which a glass melt is formed under oxidizing conditions and said glass melt has a composition in mol % comprising:
Bi 2 O 3
20-60
GeO 2
3-40
La 2 O 3
0-20
SiO 2
1-19.10
Ga 2 O 3
0-10.10
B 2 O 3
15-40
Al 2 O 3
0.5-30
WO 3
0-30
Nb 2 O 5
0-30
Ta 2 O 5
0-15
TiO 2
0-30
ZrO 2
0-30
SnO 2
0-30
Li 2 O
at least 1
M I 2 O
0-40
M II O
0-30
F and/or Cl
0-10
Bi 2 O 3 + GeO 2 + B 2 O 3 + Al 2 O 3
5-85,
where M 1 is at least one of Li, Na, K, Rb and Cs
and M 11 is at least one of Be, Mg, Ca, Sr and Ba; and which is substantially free of tellurium.
2. The process as claimed in claim 1 , in which the oxidizing conditions are produced by blowing oxygen into the glass melt.
3. The process as claimed in claim 1 , in which a polyvalent compound, which is selected from the group consisting of Nb 2 O 5 , Sb 2 O 5 , SnO 2 , Cr 2 O 3 , As 2 O 3 and V 2 O 5 , or a mixture thereof, is added to a mixture to be melted to form the glass melt.
4. A glass fiber, comprising a core and at least one cladding surrounding the core, wherein said core comprises a core glass, said at least one cladding comprises at least one cladding glass, and said core glass and/or said at least one cladding glass each have a respective composition in mol % comprising:
Bi 2 O 3
20-60
GeO 2
3-40
La 2 O 3
0-20
SiO 2
1-19.10
Ga 2 O 3
0-10.10
B 2 O 3
15-40
Al 2 O 3
0.5-30
WO 3
0-30
Nb 2 O 5
0-30
Ta 2 O 5
0-15
TiO 2
0-30
ZrO 2
0-30
SnO 2
0-30
Li 2 O
at least 1
M I 2 O
0-40
M II O
0-30
F and/or Cl
0-10
Bi 2 O 3 + GeO 2 + B 2 O 3 + Al 2 O 3
5-85,
where M 1 is at least one of Li, Na, K, Rb and Cs
and M 11 is at least one of Be, Mg, Ca, Sr and Ba and which is substantially free of tellurium.
5. The glass fiber as claimed in claim 4 , wherein said core glass is optically active.
6. The glass fiber as claimed in claim 5 , further comprising at least one further cladding, and wherein said at least one further cladding comprises a plastic.
7. A bismuth-containing glass with a composition in mol % comprising:
Bi 2 O 3
20-60
GeO 2
3-40
La 2 O 3
0-20
SiO 2
1-19.10
Ga 2 O 3
0-10.10
B 2 O 3
15-40
Al 2 O 3
0.5-30
WO 3
0-30
Nb 2 O 5
0-30
Ta 2 O 5
0-15
TiO 2
0-30
ZrO 2
0-30
SnO 2
0-30
Li 2 O
at least 1
M I 2 O
0-40
M II O
0-30
F and/or Cl
0-10
Bi 2 O 3 + GeO 2 + B 2 O 3 + Al 2 O 3
5-85,
where M 1 is at least one of Li, Na, K, Rb and Cs
and M 11 is at least one of Be, Mg, Ca, Sr and Ba; and which is substantially free of tellurium.
8. The glass as defined in claim 7 , and containing at least 3 mol % of said Li 2 O.