Structure and properties of Bi2O3---BaO---CuO glasses

The glass-forming region in the BiO_1.5---BaO---CuO system was determined, and the structure and crystallization of the glasses were investigated and compared to glasses containing CaO or SrO in place of BaO. It has been found that the glass-forming region in this system is wider than those in the BiO_1.5---CaO---CuO and BiO_1.5---SrO---CuO systems. BaBiO_2.77 was preferentially formed in the first stage of crystallization at all glass compositions. It is suggested that the Ba²⁺ ions may preferentially occupy the sites near BiO₆ octahedra, while the Ca²⁺ ions in BiO_1.5---CaO---CuO glasses may not have a site preference with respect to the BiO₆ octahedra.