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Properties and Morphology of Barium Germanate Glasses
Author(s) -
SHELBY J. E.
Publication year - 1984
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.1151-2916.1984.tb19170.x
Subject(s) - germanate , barium , materials science , phase (matter) , mineralogy , morphology (biology) , viscosity , matrix (chemical analysis) , thermal expansion , barium sulphate , analytical chemistry (journal) , chemistry , composite material , geology , metallurgy , chromatography , organic chemistry , paleontology , optoelectronics , doping , radiochemistry
The density, thermal expansion behavior, and transformation‐range viscosity of barium germanate glasses containing 0 to 9 mol% BaO were measured. The addition of BaO to Ge0 2 resulted in phase separation at all BaO concentrations. The results of the property measurements indicate that glasses containing up to 3 mol% BaO consist of a matrix of essentially pure GeO 2 with barium‐rich droplets. Glasses containing 6 mol% BaO or more consist of two interconnected vitreous phases. The morphology of glasses containing between approximately 3.5 and 5.5 mol% BaO can be altered from the droplet/matrix form to that of two continuous phases by the appropriate heat treatment.