| 摘要 |
<p> Through the present invention, excellent heat resistance and devitrification characteristics are obtained, and Na diffusion capacity is increased and power generating efficiency is increased when the present invention is used as a glass substrate for a compound semiconductor solar cell. A glass sheet including, by mass percentage based on the oxides below, 45-65% SiO2, 9-17% Al2O3, 0-1% B2O3, 0-2% MgO, 1-12% CaO, 1-15% SrO, 1.4-12% BaO, 2-6% ZrO2, 5-10% Na2O, and 2-10% K2O, MgO + CaO + SrO + BaO being 15-30%, and 2(SrO-BaO) + (K2O-Na2O) being 11.5% or less.</p> |
