Barium disilicate is one of the glass-ceramic systems where internal nucleation and crystallization can occur from quenched glass upon heat treatment without requiring nucleating agents. The structural origin of the nano-clusters formed during low temperature heat treatment is of great interest in gaining a fundamental understanding of nucleation kinetics in silicate glasses. Here, we present experimental investigations on the low temperature heat treatment of barium disilicate (BaO•2SiO₂) glass. Several experimental techniques were used to characterize the structural nature of barium disilicate glasses that were heat treated between the glass transition temperature, T_g, and the peak temperature of crystal growth, T_cr. The data show that small amounts of crystallites including BaSi₂O₅ as well as other higher Ba/Si ratio phases are formed. Moreover, unlike that reported for lower BaO content (BaO<33mol%) barium silicate glass or the analogous Li₂O−SiO₂ glasses, no clear evidence is observed for liquid/liquid phase separation in barium disilicate glass.

二硅酸钡是一种玻璃-陶瓷体系，在这种体系中，淬火玻璃可以在热处理时发生内部成核和结晶，而无需成核剂。在低温热处理过程中形成的纳米团簇的结构起源对于获得对硅酸盐玻璃中成核动力学的基本理解具有重要意义。在此，我们对二硅酸钡 (BaO•2SiO ₂ ) 玻璃的低温热处理进行了实验研究。使用几种实验技术来表征在玻璃化转变温度 T _g和晶体生长峰值温度 T _cr之间热处理的二硅酸钡玻璃的结构性质. 数据显示形成了少量的微晶，包括BaSi ₂ O ₅以及其他较高的Ba/Si 比相。此外，与报道的较低 BaO 含量 (BaO<33 mol%) 钡硅酸盐玻璃或类似的 Li ₂ O-SiO ₂玻璃不同，在二硅酸钡玻璃中没有观察到液/液相分离的明确证据。