Glass sheet with high energy transmission
The invention relates to an extra-clear glass sheet, i.e. a glass sheet with high energy transmission, which can be used in particular in the field of solar energy. Specifically, the invention relates to a glass sheet having a composition that includes, in an amount expressed in wt % for the total weight of the glass: 60-78% of SiO2; 0-10% of Al2O3; 0-5% of B2O3; 0-15% of CaO; 0-10% of MgO; 5-20% of Na2O; 0-10% of K2O; 0-5% of BaO, wherein the total amount of iron (in the form of Fe2O3) is 0.002-0.03%, and the composition includes a ratio of manganese/(total iron) of 1 to 8.5, the manganese content being expressed in the form of MnO in wt % relative to the total weight of the glass.
1. A glass sheet having a composition comprising, in a content expressed as percentages by total weight of glass:
60 to 78% SiO 2 ;
0 to 10% Al 2 O 3 ;
0 to 5% B 2 O 3 ;
0 to 15% CaO;
0 to 10% MgO;
5 to 20% Na 2 O;
0 to 10% K 2 O;
0 to 5% BaO;
0.002 to 0.03% total iron expressed in the form of Fe 2 O 3 ; and
manganese
wherein the composition comprises a manganese/(total iron) ratio of 1 to 8.5, a manganese content being expressed in the form of MnO as percentage by weight, with respect to the total weight of the glass, and
wherein the composition comprises a manganese expressed in the form of MnO content of 0.005% to 0.2% by weight, with respect to the total weight of the glass.
2. The glass sheet of claim 1 , wherein the composition comprises a manganese/(total iron) ratio of 2.5 to 6.5.
3. The glass sheet of claim 1 , wherein the composition comprises a total iron expressed in the form of Fe 2 O 3 content of 0.002% to 0.02% by weight, with respect to the total weight of the glass.
4. The glass sheet of claim 1 , wherein the composition comprises a manganese expressed in the form of MnO content of 0.01% to 0.2% by weight, with respect to the total weight of the glass.
5. The glass sheet of claim 1 , further comprising cerium, wherein a cerium content expressed in the form of CeO 2 is ≦0.02% by weight, with respect to the total weight of the glass.
6. The glass sheet of claim 5 , further comprising vanadium, wherein the vanadium content expressed in the form of V 2 O 5 is ≦0.005% by weight, with respect to the total weight of the glass, and the cerium content expressed in the form of CeO 2 is ≦0.01% by weight, with respect to the total weight of the glass.
7. The glass sheet of claim 1 , further comprising vanadium, wherein a vanadium content expressed in the form of V 2 O 5 is ≦0.01% by weight, with respect to the total weight of the glass.
8. The glass sheet of claim 1 , further comprising antimony, wherein an antimony content expressed in the form of Sb 2 O 3 is <0.2% by weight, with respect to the total weight of the glass.
9. The glass sheet of claim 1 , wherein the glass sheet has an energy transmission, measured for a thickness of 3.85 mm, of at least 90%.
10. The glass sheet of claim 1 , wherein the glass sheet is coated with at least one transparent and electrically conducting thin layer.
11. The glass sheet of claim 1 , wherein the glass sheet is coated with at least one dirt-repellent layer.
12. The glass sheet of claim 1 , wherein the glass sheet is coated with at least one antireflection layer.
13. The glass sheet of claim 1 , wherein the glass sheet is coated with at least one mirror layer.
14. The glass sheet of claim 1 , wherein the composition comprises a total iron expressed in the form of Fe 2 O 3 content of 0.005% to 0.03% by weight, with respect to the total weight of the glass.
15. A solar photovoltaic module or mirror for concentrating solar energy, comprising at least one glass sheet of claim 1 .
16. A glass sheet having a composition consisting essentially of, in a content expressed as percentages by total weight of glass:
60 to 78% SiO 2 ;
0 to 10% Al 2 O 3 ;
0 to 5% B 2 O 3 ;
0 to 15% CaO;
0 to 10% MgO;
5 to 20% Na 2 O;
0 to 10% K 2 O;
0 to 5% BaO;
0.002 to 0.03% total iron expressed in the form of Fe 2 O 3 ; and
manganese
wherein the composition comprises a manganese/(total iron) ratio of 1 to 8.5, a manganese content being expressed in the form of MnO as percentage by weight, with respect to the total weight of the glass, and
wherein the composition comprises a manganese expressed in the form of MnO content of 0.005% to 0.2% by weight, with respect to the total weight of the glass.
17. The glass sheet of claim 16 , wherein the composition comprises a manganese/(total iron) ratio of 2.5 to 6.5.
18. The glass sheet of claim 16 , wherein the composition comprises a total iron expressed in the form of Fe 2 O 3 content of 0.005% to 0.03% by weight, with respect to the total weight of the glass.
19. The glass sheet of claim 16 , wherein the composition comprises a manganese expressed in the form of MnO content of 0.01% to 0.2% by weight, with respect to the total weight of the glass.
20. The glass sheet of claim 16 , further comprising cerium, wherein a cerium content expressed in the form of CeO 2 is ≦0.02% by weight, with respect to the total weight of the glass.