Solid-state transformations of Zn-clinoptilolite through heating
| Autor: | Guido Cerri, Antonio Brundu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Clinoptilolite
Materials science Solid-state Analytical chemistry chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Cristobalite 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry Aluminium Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry 0210 nano-technology Heating time Zeolite Quartz |
| Zdroj: | Journal of Solid State Chemistry. 283:121165 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2019.121165 |
| Popis: | Zn-clinoptilolite was heated and analyzed ex-situ. Breakdown occurred between 400-700 °C. After 2 h at 850 °C gahnite and Zn-β-quartz nucleated. Exolution of zinc and aluminum from Zn-β-quartz determined Zn-α-quartz formation after 8 h. An increase in temperature and/or heating time determined exolution also in Zn-α-quartz, that progressively turned into cristobalite. Zn-β-quartz decreased over time at 1000 °C and disappeared after 100 h, whereas at 900 °C the quantitative ratio β-quartz/α-quartz asymptotically stabilized at ≈2.5. Rietveld refinements evidenced that at 900 °C the decrease of zinc occupancy followed an almost asymptotic path in both quartz phases. Considering the formula ZnxAl2xSi3-2xO6, if x |
| Databáze: | OpenAIRE |
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