Structure and dehydration of hydrous tin dioxide xerogel
| Autor: | I. V. Lin’ko, A. V. Kostrikin, R. V. Kuznetsova, F. M. Spiridonov, L. N. Komissarova, O. V. Kosenkova |
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| Rok vydání: | 2007 |
| Předmět: |
Condensation polymer
Hydrogen bond Tin dioxide Materials Science (miscellaneous) Inorganic chemistry Cassiterite chemistry.chemical_element engineering.material medicine.disease Inorganic Chemistry chemistry.chemical_compound chemistry medicine engineering Hydroxide Molecule Dehydration Physical and Theoretical Chemistry Tin |
| Zdroj: | Russian Journal of Inorganic Chemistry. 52:1098-1104 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s0036023607070182 |
| Popis: | Hydrous tin dioxide xerogel with the composition SnO2 · 1.75H2O is built of tin-oxygen-hydroxide fragments. Water molecules (no more than 1 mol) in the grain structure are kept by hydrogen bonds. Xerogel is dehydrated in the range 50–890°C in two stages. Below 123°C, molecular water is removed and the polycondensation of ≡Sn-O(H)-Sn≡ bridge groups occurs. There also takes place the transition of some water molecules from the molecular to hydroxide form as follows: ≡Sn-O-Sn≡ + H2O → 2≡Sn-O-H. All processes occur within individual grains. Above 123°C, water removal is due to the polycondensation of tin-oxygen groups. As a result, grains are coarsen. After 200°C, their structure is determined as cassiterite coated by tin oxyhydrate. |
| Databáze: | OpenAIRE |
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