Composition and structure of tungsten antimony acid
Tungsten antimony acids (TAA) with the composition H(2)Sb(2)WXO6·nH2O (0 < x ≤ 1.45; 0 < n ≤ 2.0) have been synthesized by hydrolysis of antimony trichloride pre-oxidized with nitric acid in the presence of varying amounts of Na2WO4. To obtain TAA protonated forms, the samples were kept in a 9...
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Voronezh State University
2024-03-01
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| Series: | Конденсированные среды и межфазные границы |
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| Online Access: | https://journals.vsu.ru/kcmf/article/view/11818/11988 |
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| author | Pyotr V. Timushkov Vladimir A. Burmistrov Maxim N. Ulyanov Victor N. Semenov |
| author_facet | Pyotr V. Timushkov Vladimir A. Burmistrov Maxim N. Ulyanov Victor N. Semenov |
| author_sort | Pyotr V. Timushkov |
| collection | DOAJ |
| description | Tungsten antimony acids (TAA) with the composition H(2)Sb(2)WXO6·nH2O (0 < x ≤ 1.45; 0 < n ≤ 2.0) have been synthesized by hydrolysis of antimony trichloride pre-oxidized with nitric acid in the presence of varying amounts of Na2WO4. To obtain TAA protonated forms, the samples were kept in a 96% solution of sulphuric acid, the precipitate was washed until reaction became neutral and dried in air. The amount of tungsten, antimony, and silver ions in TAA was determined using energy dispersive analysis. Changes in structural parameters upon doping of AA with tungsten ions were studied using a Bruker D8 ADVANCE X-ray diffractometer (CuKa1-radiation). The number of oxonium ions in TAA was determined by the substitution
of these ions by silver ions in equivalent amounts (Ag+-TAA forms).
All obtained TAA samples and Ag+ TAA forms had a pyrochlore-type structure, space group symmetry Fd3m. Refinement of the arrangement of atoms in the structure using the Rietveld method showed that tungsten ions replace antimony ions and are statistically located in 16c, oxygen anions in 48f, and oxonium ions and water molecules in 16d and 8b positions, respectively.
When tungsten ions were introduced into samples, the structural parameters of the resulting phases changed. There was a decrease in the unit cell parameter and the distance between antimony ions and oxygen anions, while an increase in the distance between oxonium ions and oxygen anions located in 48f positions was observed. This allowed the removal of a proton from oxonium molecules and its transport via a system of hydrogen bonds formed by water molecules |
| first_indexed | 2024-04-24T12:30:19Z |
| format | Article |
| id | doaj.art-1501c41aea854b1bb70fc3a6b3ef74d3 |
| institution | Directory Open Access Journal |
| issn | 1606-867X |
| language | English |
| last_indexed | 2024-04-24T12:30:19Z |
| publishDate | 2024-03-01 |
| publisher | Voronezh State University |
| record_format | Article |
| series | Конденсированные среды и межфазные границы |
| spelling | doaj.art-1501c41aea854b1bb70fc3a6b3ef74d32024-04-08T05:55:01ZengVoronezh State UniversityКонденсированные среды и межфазные границы1606-867X2024-03-0126110.17308/kcmf.2024.26/11818Composition and structure of tungsten antimony acidPyotr V. Timushkov0https://orcid.org/0009-0005-2226-3076Vladimir A. Burmistrov1https://orcid.org/0000-0002-7862-6017Maxim N. Ulyanov2https://orcid.org/0000-0003-0066-9559Victor N. Semenov3https://orcid.org/0000-0002-4247-5667Chelyabinsk State University, 70b ul. Molodogvardeytsev, Chelyabinsk 45402, Russian FederationChelyabinsk State University, 70b ul. Molodogvardeytsev, Chelyabinsk 45402, Russian FederationChelyabinsk State University, 70b ul. Molodogvardeytsev, Chelyabinsk 45402, Russian FederationVoronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian FederationTungsten antimony acids (TAA) with the composition H(2)Sb(2)WXO6·nH2O (0 < x ≤ 1.45; 0 < n ≤ 2.0) have been synthesized by hydrolysis of antimony trichloride pre-oxidized with nitric acid in the presence of varying amounts of Na2WO4. To obtain TAA protonated forms, the samples were kept in a 96% solution of sulphuric acid, the precipitate was washed until reaction became neutral and dried in air. The amount of tungsten, antimony, and silver ions in TAA was determined using energy dispersive analysis. Changes in structural parameters upon doping of AA with tungsten ions were studied using a Bruker D8 ADVANCE X-ray diffractometer (CuKa1-radiation). The number of oxonium ions in TAA was determined by the substitution of these ions by silver ions in equivalent amounts (Ag+-TAA forms). All obtained TAA samples and Ag+ TAA forms had a pyrochlore-type structure, space group symmetry Fd3m. Refinement of the arrangement of atoms in the structure using the Rietveld method showed that tungsten ions replace antimony ions and are statistically located in 16c, oxygen anions in 48f, and oxonium ions and water molecules in 16d and 8b positions, respectively. When tungsten ions were introduced into samples, the structural parameters of the resulting phases changed. There was a decrease in the unit cell parameter and the distance between antimony ions and oxygen anions, while an increase in the distance between oxonium ions and oxygen anions located in 48f positions was observed. This allowed the removal of a proton from oxonium molecules and its transport via a system of hydrogen bonds formed by water moleculeshttps://journals.vsu.ru/kcmf/article/view/11818/11988solid electrolytes of antimony oxidetungsten oxidesantimony acidpyrochlore type structure |
| spellingShingle | Pyotr V. Timushkov Vladimir A. Burmistrov Maxim N. Ulyanov Victor N. Semenov Composition and structure of tungsten antimony acid Конденсированные среды и межфазные границы solid electrolytes of antimony oxide tungsten oxides antimony acid pyrochlore type structure |
| title | Composition and structure of tungsten antimony acid |
| title_full | Composition and structure of tungsten antimony acid |
| title_fullStr | Composition and structure of tungsten antimony acid |
| title_full_unstemmed | Composition and structure of tungsten antimony acid |
| title_short | Composition and structure of tungsten antimony acid |
| title_sort | composition and structure of tungsten antimony acid |
| topic | solid electrolytes of antimony oxide tungsten oxides antimony acid pyrochlore type structure |
| url | https://journals.vsu.ru/kcmf/article/view/11818/11988 |
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