Chemical compositions and crystallization behavior of BaO-TiO_2-GeO_2 Glass

摘要

We prepared glasses in 30BaO-(15+x)TiO_2-(55-x)GeO_2 composition (x=0, 10,20, 35) and examined their crystallization behavior. Relation of crystallizing-phase to optical transparency in the resulting crystallized sample was also considered. Although the glass samples with x=0-20, which precipitate fresnoite-type Ba_2TiGe_2O_8 as main phase, lost transparency after crystallization, the glass with x=30, which precipitates BaTi_4O_9 phase, kept good transparency. Dependence of transparency on the x is also discussed.