Ceramics-Silikáty 45 (3) 111-114 (2001)

LIQUID PHASE SEPARATION IN THE SYSTEMS TeO₂-B₂O₃-M₂O₃ (M₂O₃ = Al₂O₃, Ga₂O₃, Sc₂O₃, La₂O₃, Bi₂O₃)

E. Kashchieva, M. Pankova, Y. Dimitriev 

Liquid phase separation was studied in three component systems TeO₂-B₂O₃-M₂O₃, where M₂O₃ = Al₂O₃, Ga₂O₃, Sc₂O₃, La₂O₃ and Bi₂O₃. The boundaries between one- and two-phase glasses were determined. Near these boundaries different cases of microheterogeneous structure as a result of metastable immiscibility were established by transmission electron microscopy (TEM). IR data analysis indicated that the existence of homogeneous glasses is related with the simultaneous participation of BO₃- and BO₄-groups in the glassy network.

Keywords: TeO₂ glasses, Immiscibility, Microstructure