Ceramics-Silikáty 45, (3) 111 - 114 (2001) |
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LIQUID PHASE SEPARATION IN THE SYSTEMS TeO₂-B₂O₃-M₂O₃ (M₂O₃ = Al₂O₃, Ga₂O₃, Sc₂O₃, La₂O₃, Bi₂O₃)
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Kashchieva Elena, Pankova Milka, Dimitriev Yanko
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University of Chemical Technology and Metallurgy,
8 Kl. Ohridsky Blvd, 1756 - Sofia, Bulgaria
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Keywords: TeO₂ glasses, Immiscibility, Microstructure
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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. |
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