{"title":"Thermal behavior and crystallization of alkali aluminosilicate sealants for SOFC: Effect of Al2O3 to Y2O3 substitution","authors":"D.Yu. Dubovtsev , A.I. Vepreva , D.V. Boldyrev , N.S. Saetova , A.V. Kuzmin","doi":"10.1016/j.jnoncrysol.2024.123255","DOIUrl":null,"url":null,"abstract":"<div><div>The influence of the gradual replacement of Al<sub>2</sub>O<sub>3</sub> with Y<sub>2</sub>O<sub>3</sub> in alkali-containing silica glass sealants is studied with a detailed discussion of crystallization kinetics. Such substitution has a complex effect on <em>T</em><sub>g</sub>, <em>T</em><sub>sphere</sub>, <em>T</em><sub>HS</sub>, and <em>T</em><sub>flowing</sub> which might be connected with the role of yttrium in the glass network. An increase in the Y<sub>2</sub>O<sub>3</sub> content is found to intensify crystallization, causing the growth of the crystalline phase fraction. At the same time, intense crystallization appears to have no pronounced effect on the coefficient of thermal expansion: its average increment after 1000 h of exposure at 850 °C in air atmosphere is <1‧10<sup>−6</sup> <em>K</em><sup>−1</sup>. The only crystalline phase observed in samples with Y<sub>2</sub>O<sub>3</sub> content greater than 2 wt % is suggested to be Na<sub>0.8</sub>Ca<sub>0.3</sub>Y<sub>0.4</sub>Zr<sub>0.22</sub>Si<sub>2.13</sub>O<sub>6</sub> which is the Ca<sup>2</sup><sup>+</sup>- and Zr<sup>4+</sup>-substituted isomorph of NaYSi<sub>2</sub>O<sub>6</sub>.</div></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"646 ","pages":"Article 123255"},"PeriodicalIF":3.2000,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Non-crystalline Solids","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022309324004320","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}
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Abstract
The influence of the gradual replacement of Al2O3 with Y2O3 in alkali-containing silica glass sealants is studied with a detailed discussion of crystallization kinetics. Such substitution has a complex effect on Tg, Tsphere, THS, and Tflowing which might be connected with the role of yttrium in the glass network. An increase in the Y2O3 content is found to intensify crystallization, causing the growth of the crystalline phase fraction. At the same time, intense crystallization appears to have no pronounced effect on the coefficient of thermal expansion: its average increment after 1000 h of exposure at 850 °C in air atmosphere is <1‧10−6K−1. The only crystalline phase observed in samples with Y2O3 content greater than 2 wt % is suggested to be Na0.8Ca0.3Y0.4Zr0.22Si2.13O6 which is the Ca2+- and Zr4+-substituted isomorph of NaYSi2O6.
期刊介绍：
The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid.
In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.
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