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Phase Equilibria and Liquid Immiscibility in the System PbO‐B 2 O 3 ‐SiO 2
Author(s) -
JOHNSON DAVID W.,
HUMMEL F. A.
Publication year - 1968
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.1151-2916.1968.tb11872.x
Subject(s) - liquidus , borosilicate glass , dome (geology) , metastability , materials science , texture (cosmology) , phase (matter) , opacity , phase diagram , mineralogy , thermodynamics , scanning electron microscope , analytical chemistry (journal) , chemistry , geology , metallurgy , composite material , optics , chromatography , physics , organic chemistry , alloy , artificial intelligence , computer science , image (mathematics) , paleontology
A detailed study of the system Pb0–B 2 0 3 –Si0 2 was undertaken because of the interest in lead borosilicate fluxes and the possibility of producing opaque low‐melting enamels by controlled liquid‐phase separations. Studies in the portion of the system containing greater than 60% PbO produced little change from previous work. The shape of the liquidus surface beneath the two‐liquid region and the shape of the immiscibility dome were determined. Much of the observed immiscibility is metastable, particularly for compositions containing greater than 40% SiO 2 . Using the electron microscope provided information on the way the rate of formation, stability, and texture of the immiscible liquids are affected by composition, time, and temperature. Finally, a high‐temperature centrifuge was constructed to separate the immiscible liquids and thus define tie lines within the immiscibility dome.