| 摘要 |
<p>The present invention is related to transparent, fast darkening and fading photochromic glasses. The glasses contain SiO2, B2O3, Al2O3, ZrO2, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, ZnO, La2O3, Nb2O5, TiO2 as base glass components, Ag, Br, Cl, CuO as photochromic elements, with, optionally Sb2O3, As2O3, and SnO2 as colorants to impart a brown color at darkening. The glasses have a refractive index greater than 1.585, an Abbe number greater than 42, and a density lower than about 2.80 g/cm<3>.</p> |
