Ya.A. Moroz, N. S. Lozinskii, A. N. Lopanov, K. A. Chebyshev, M. Yu. Zelenskii, E. A. Fanina
{"title":"Low-Temperature Synthesis of Tungsten Silicates with Pyrochlore and Tungsten Bronze Structure","authors":"Ya.A. Moroz, N. S. Lozinskii, A. N. Lopanov, K. A. Chebyshev, M. Yu. Zelenskii, E. A. Fanina","doi":"10.1007/s10717-024-00708-8","DOIUrl":null,"url":null,"abstract":"<p>Polyoxotungstosilicates with the general formulas Cat<sub>4</sub>[SiW<sub>12</sub>O<sub>40</sub>] · <i>m</i>H<sub>2</sub>O and Cat<sub>6</sub>[SiW<sub>11</sub>O<sub>39</sub>Ni(H<sub>2</sub>O)] · <i>n</i>H<sub>2</sub>O were synthesized, where Cat = Rb<sup>+</sup>, Cs<sup>+</sup>, (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>. By means of IR spectroscopy and x-ray diffraction analysis, it was shown that the compounds have the Keggin anion structure. The thermolysis of the obtained compounds within the temperature range of 600 – 800°C resulted in the formation of previously unknown pyrochlore-structure phases Rb<sub>12/13</sub>Si<sub>2/13</sub>W<sub>22/13</sub>Ni<sub>2/13</sub>O<sub>6</sub> and Cs<sub>12/13</sub>Si<sub>2/13</sub>W<sub>22/13</sub>Ni<sub>2/13</sub>O<sub>6</sub> with the with the unit cell parameters <i>a</i> of 10.284 and 10.309 Å, as well as phases with tungsten bronze structure Rb<sub>12/20</sub>Si<sub>3/20</sub>W<sub>36/20</sub>O<sub>6</sub> and Si<sub>3/38</sub>W<sub>36/38</sub>O<sub>3</sub>. The synthesis of tungsten silicates with pyrochlore and tungsten bronze structure through thermolysis of polyoxotungstosilicates reduces the temperature of their preparation to 600 – 650°C and heating time to 1 h, thus extending the ranges of chemical compositions and their morphological diversity.</p>","PeriodicalId":579,"journal":{"name":"Glass and Ceramics","volume":"81 7-8","pages":"335 - 341"},"PeriodicalIF":0.6000,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Glass and Ceramics","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10717-024-00708-8","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}
引用次数: 0
Abstract
Polyoxotungstosilicates with the general formulas Cat4[SiW12O40] · mH2O and Cat6[SiW11O39Ni(H2O)] · nH2O were synthesized, where Cat = Rb+, Cs+, (CH3)4N+. By means of IR spectroscopy and x-ray diffraction analysis, it was shown that the compounds have the Keggin anion structure. The thermolysis of the obtained compounds within the temperature range of 600 – 800°C resulted in the formation of previously unknown pyrochlore-structure phases Rb12/13Si2/13W22/13Ni2/13O6 and Cs12/13Si2/13W22/13Ni2/13O6 with the with the unit cell parameters a of 10.284 and 10.309 Å, as well as phases with tungsten bronze structure Rb12/20Si3/20W36/20O6 and Si3/38W36/38O3. The synthesis of tungsten silicates with pyrochlore and tungsten bronze structure through thermolysis of polyoxotungstosilicates reduces the temperature of their preparation to 600 – 650°C and heating time to 1 h, thus extending the ranges of chemical compositions and their morphological diversity.
期刊介绍：
Glass and Ceramics reports on advances in basic and applied research and plant production techniques in glass and ceramics. The journal''s broad coverage includes developments in the areas of silicate chemistry, mineralogy and metallurgy, crystal chemistry, solid state reactions, raw materials, phase equilibria, reaction kinetics, physicochemical analysis, physics of dielectrics, and refractories, among others.
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