{"title":"Phase Separation in the System BaO-SiO2","authors":"T. P. SEWARD III, D. R. UHLMANN, DAVID TURNBULL","doi":"10.1111/j.1151-2916.1968.tb13858.x","DOIUrl":null,"url":null,"abstract":"<p>A simple, rapid-quenching device was used to investigate the extent of liquid-liquid immiscibility in the system BaO-SiO<sub>2</sub>. A metastable miscibility gap was found with an upper consolute point at about 10 mole % BaO and 146OOC. Bulk glass samples of different compositions and heat treatments were examined by direct-transmission electron microscopy to determine the phase separation morphology. At low BaO contents the separation was characterized by spherical barium-rich particles in a silica-rich matrix. For compositions near the center of the gap, the structure consisted of two phases continuously interconnected throughout the bulk of the glass. At higher BaO contents, spherical silica-rich particles were found in a barium-rich matrix. The dependence of the morphology on quench rate and heat treatment was investigated. Predictions of other authors concerning the occurrence of BaO-SiO<sub>2</sub> immiscibility are compared with the present results.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"51 5","pages":"278-285"},"PeriodicalIF":3.5000,"publicationDate":"1968-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/j.1151-2916.1968.tb13858.x","citationCount":"119","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1968.tb13858.x","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 119
Abstract
A simple, rapid-quenching device was used to investigate the extent of liquid-liquid immiscibility in the system BaO-SiO2. A metastable miscibility gap was found with an upper consolute point at about 10 mole % BaO and 146OOC. Bulk glass samples of different compositions and heat treatments were examined by direct-transmission electron microscopy to determine the phase separation morphology. At low BaO contents the separation was characterized by spherical barium-rich particles in a silica-rich matrix. For compositions near the center of the gap, the structure consisted of two phases continuously interconnected throughout the bulk of the glass. At higher BaO contents, spherical silica-rich particles were found in a barium-rich matrix. The dependence of the morphology on quench rate and heat treatment was investigated. Predictions of other authors concerning the occurrence of BaO-SiO2 immiscibility are compared with the present results.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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