| 摘要 |
<p>[PROBLEMS] The invention aims at obtaining a glass which has a coefficient of thermal expansion of 40 OE10<SUP>-7</SUP> to 50 OE10<SUP>-7</SUP>/°C and which has viscosity characteristics favorable for stable production of thin and large-sized glass substrates and is suitable for TFT-LCD's, particularly a-Si TFT-LCD's. [MEANS FOR SOLVING PROBLEMS] A nonalkaline glass, characterized by having a glass composition consisting of by mass 45 to 65% SiO<SUB>2</SUB>, 12 to 17% Al<SUB>2</SUB>O<SUB>3</SUB>, 7.5 to 15% B<SUB>2</SUB>O<SUB>3</SUB>, 0 to 3% MgO, 5.5 to 15% CaO, 0 to 5% SrO, 5 to 15% BaO, 0 to 5% ZnO, 15 to 23% (MgO+CaO+SrO+BaO+ZnO), 0 to 5% ZrO<SUB>2</SUB>, 0 to 5% TiO<SUB>2</SUB> and 0 to 5% P<SUB>2</SUB>O<SUB>5,</SUB>being substantially free from alkali metal oxides, and having a (CaO+BaO-MgO)/SiO<SUB>2</SUB> value by mass fraction of 0.25 to 0.4 and a mean coefficient of thermal expansion of 40 OE10<SUP>-7</SUP> to 50 OE10<SUP>-7</SUP>/°C over the temperature range of 30 to 380°C.</p> |
