Pressure-induced chemical reordering in supercooled polyionic sulfophosphate liquids
| Autor: | Lothar Wondraczek, Sabyasachi Sen, Bruno Poletto Rodrigues |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Ionic bonding 02 engineering and technology Nuclear magnetic resonance spectroscopy 021001 nanoscience & nanotechnology Condensed Matter Physics Phosphate 01 natural sciences Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound symbols.namesake chemistry Chemical engineering 0103 physical sciences Ionic liquid Materials Chemistry Ceramics and Composites symbols Sulfate 0210 nano-technology Supercooling Raman spectroscopy |
| Zdroj: | Journal of Non-Crystalline Solids |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2018.07.019 |
| Popis: | In situ pVT analyses of poly-ionic Na-Zn sulfophosphate liquids and glasses are carried out in conjunction with ex situ structural characterization using Raman and multi-nuclear (31P and 23Na) NMR spectroscopy. These ionic liquids exhibit highly homogeneous compaction behavior even close to their densification limit. With proceeding densification, no changes are seen on short-range order, however, both the increasing substitution of phosphate by sulfate and the high-pressure, high-temperature treatments show structural and thermodynamic indications of increasing chemical immiscibility, with the sodium ions preferring to surround the sulfate groups while the zinc ions prefer to neighbor the phosphate groups. It appears that such non-random cation distribution and its enhancement by structural compaction facilitates the densification behaviour of ionic glasses. |
| Databáze: | OpenAIRE |
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