Phase Equilibrium in a Portion of the Ternary System Ba OA-I2,O3,-SiO2, |
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Authors: | ROBERT H THOMAS |
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Affiliation: | School of Ceramics, Rutgers University, New Brunswick, New Jersey |
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Abstract: | Phase-equilibrium relations on the liquidus surface in the system Ba0-A12O3-SiO2 have been investigated by the quenching method. The compositions investigated within the ternary area were those containing less than 30%, A12O3 and more than 20% SiO2 by weight. Petrographic and X-ray techniques were employed in the determination of the crystalline phases. The crystal phases that separate from melts within the area investigated are barium orthosilicate (2BaO. SiO2,), barium metasilicate (BaO 2SO2,), solid solutions, sanbornite (BaO 2SiO2), tridymite and cristobalite (SO2), mullite (3A12O3 2SiO2), and celsian (BaO A12O3.2SiO2). Diagrams show the isotherms and indices of refraction of the glasses. Five quintuple points and eleven boundary curves have been determined within = .5yo compositional variations. The liquidus-surface temperatures have been obtained within limits of ± 125°C. |
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