METAPHOSPHATE GLASS COMPOSITION

摘要

A low-K crystallizable glass composition having a softening point of 550-800 °C, consisting essentially by mole % of: 41-70 % P2O5; 10-48 % MgO, ZnO or mixtures thereof; 2-20 % Al2O3, Cr2O3 or mixtures thereof; 0-10 % alkali metal oxide(s); 0-10 % CaO, SrO, BaO or mixtures thereof; 0-10 % SiO2; 0-20 % B2O3; 0-10 % ZrO2, TiO2 or mixtures thereof; and 0-10 % of a rare earth metal oxide or mixtures thereof, with the provisos that: (i) a = n(b+3c+d+e+2f+3g), wherein n = 0.8-1.0, and a = mole % P2O5; b = mole % MgO, ZnO or mixtures therof; c = mole % Al2O3, Cr2O3 or mixtures thereof; d = mole % M2O, where M = Na, K, Rb, Cs; e = mole % M'O, where M' = Ca, Sr, Ba; f = mole % ZrO2, TiO2 or mixtures thereof; g = mole % Fe2O3, Y2O3, La2O3, Ln2O3 (where Ln is any of the rare earth elements), or mixtures thereof; (ii) the total amount of alkali oxides, CaO, SrO, and BaO does not exceed 10 mole %; (iii) the total amount of ZrO2, TiO2, Fe2O3, and rare earth metal oxide does not exceed 10 mole %.