| 摘要 |
A glass according to the present invention is characterized by having a glass composition comprising SiO2, Al2O3, B2O3 and RO (wherein RO represents at least one component selected from MgO, CaO, SrO and BaO), and also characterized in that at least two types of crystals independently selected from a SiO2-Al2O3-RO-based crystal, a SiO2-based crystal and a SiO2-Al2O3-based crystal is precipitated in a temperature range from a liquidus temperature to a temperature that is lower by -50°C than the liquidus temperature. |
