{"title":"络合铝酸盐Dy2SrAl2O7的形成及热稳定性","authors":"V. F. Popova, V. L. Ugolkov, E. A. Tugova","doi":"10.1134/S1087659625600061","DOIUrl":null,"url":null,"abstract":"<p>The formation conditions and processes of the complex aluminate Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> are studied. It is established that solid-state synthesis of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> proceeds through the formation of strontium aluminate SrAl<sub>2</sub>O<sub>4</sub>. At temperatures above 1200°C, active interaction begins between the intermediate compound SrAl<sub>2</sub>O<sub>4</sub> and Dy<sub>2</sub>O<sub>3</sub>, associated with the transition of the two-dimensional nonautonomous phase SrAl<sub>2</sub>O<sub>4</sub> into a liquid-like state. The thermal stability of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> up to the temperature of incongruent melting at 1750°С is characterized for the first time. The coefficient of thermal expansion (CTE) of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> is experimentally determined to be 8 × 10<sup>–6</sup> K<sup>–1</sup> in the temperature range of 400–1300°С. It is shown that active sintering of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> begins at 1300°С. A change in the type of melting diagrams is shown in the <i>Ln</i><sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> series, where <i>Ln</i> = La → Gd → Dy, Ho. A decrease in both melting temperatures and CTE values is revealed across the <i>Ln</i><sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> series (<i>Ln</i> = La → Ho).</p>","PeriodicalId":580,"journal":{"name":"Glass Physics and Chemistry","volume":"51 3","pages":"337 - 343"},"PeriodicalIF":0.6000,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Formation and Thermal Stability of the Complex Aluminate Dy2SrAl2O7\",\"authors\":\"V. F. Popova, V. L. Ugolkov, E. A. Tugova\",\"doi\":\"10.1134/S1087659625600061\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The formation conditions and processes of the complex aluminate Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> are studied. It is established that solid-state synthesis of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> proceeds through the formation of strontium aluminate SrAl<sub>2</sub>O<sub>4</sub>. At temperatures above 1200°C, active interaction begins between the intermediate compound SrAl<sub>2</sub>O<sub>4</sub> and Dy<sub>2</sub>O<sub>3</sub>, associated with the transition of the two-dimensional nonautonomous phase SrAl<sub>2</sub>O<sub>4</sub> into a liquid-like state. The thermal stability of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> up to the temperature of incongruent melting at 1750°С is characterized for the first time. The coefficient of thermal expansion (CTE) of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> is experimentally determined to be 8 × 10<sup>–6</sup> K<sup>–1</sup> in the temperature range of 400–1300°С. It is shown that active sintering of Dy<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> begins at 1300°С. A change in the type of melting diagrams is shown in the <i>Ln</i><sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> series, where <i>Ln</i> = La → Gd → Dy, Ho. A decrease in both melting temperatures and CTE values is revealed across the <i>Ln</i><sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> series (<i>Ln</i> = La → Ho).</p>\",\"PeriodicalId\":580,\"journal\":{\"name\":\"Glass Physics and Chemistry\",\"volume\":\"51 3\",\"pages\":\"337 - 343\"},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2025-09-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Glass Physics and Chemistry\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1087659625600061\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Glass Physics and Chemistry","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S1087659625600061","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Formation and Thermal Stability of the Complex Aluminate Dy2SrAl2O7
The formation conditions and processes of the complex aluminate Dy2SrAl2O7 are studied. It is established that solid-state synthesis of Dy2SrAl2O7 proceeds through the formation of strontium aluminate SrAl2O4. At temperatures above 1200°C, active interaction begins between the intermediate compound SrAl2O4 and Dy2O3, associated with the transition of the two-dimensional nonautonomous phase SrAl2O4 into a liquid-like state. The thermal stability of Dy2SrAl2O7 up to the temperature of incongruent melting at 1750°С is characterized for the first time. The coefficient of thermal expansion (CTE) of Dy2SrAl2O7 is experimentally determined to be 8 × 10–6 K–1 in the temperature range of 400–1300°С. It is shown that active sintering of Dy2SrAl2O7 begins at 1300°С. A change in the type of melting diagrams is shown in the Ln2SrAl2O7 series, where Ln = La → Gd → Dy, Ho. A decrease in both melting temperatures and CTE values is revealed across the Ln2SrAl2O7 series (Ln = La → Ho).
期刊介绍:
Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.