Method of making a borosilicate glass, borate glass and crystallized boron-containing material

摘要

In order to make possible to produce low alkali material with homogeneity and high purity, the present invention provides a method for producing a borate-containing low-alkali material, boron-containing molten material, a device using an alternating electromagnetic field is derived directly heated, as a component, a quantitative ratio of 25 mol%, including at least one metal oxide, the metal ion of the metal oxide, it has a valence of at least 2, the molten material is melted, at least The ratio of the molar amount of substance of silicon dioxide for the borate material is to provide a method is 0.5 or less.