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Effect of Small Additions of Al 2 O 3 and Ga 2 O 3 on the Immiscibility Temperature of Na 2 O‐SiO 2 Glasses
Author(s) -
TOPPING J. A.,
MURTHY M. K.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12486.x
Subject(s) - miscibility , silicate , spinodal decomposition , oxide , mineralogy , materials science , solid solution , analytical chemistry (journal) , chemistry , metallurgy , phase (matter) , polymer , composite material , organic chemistry
Alumina and gallia were substituted separately for Na 2 O in amounts of 0.2, 0.5, 1.0, 1.5, 2.0, and 3.0 wt% in three Na 2 O‐SiO 2 glass compositions (82, 84, and 86 wt% SiO 2 ) within the immiscibility region. The immiscibility regions for each system extend to ∼1.5 mol% of the added oxide. In general, the addition reduced the immiscibility temperature ( T m ), but at the edge of the immiscibility region (82% SiO 2 ) the Na 2 O loss effect initially increased T m . A structural model of the miscibility of Al 2 O 3 added to silicate glasses is presented.