In situ synchrotron XRD measurements during solidification of a melt in the CaO–SiO2 system using an aerodynamic levitation system
| Autor: | Christian Adam, Florian Kargl, Oleh Ivashko, Katharina Schraut |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Synchrotron Aerodynamic levitation law.invention chemistry.chemical_compound chemistry Beamline law Metastability 0103 physical sciences Calcium silicate Levitation General Materials Science Crystallization 010306 general physics 0210 nano-technology Supercooling |
| Zdroj: | Journal of Physics: Condensed Matter. 33:264003 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/1361-648x/abf7e1 |
| Popis: | Phase formation and evolution was investigated in the CaO–SiO2 system in the range of 70–80 mol% CaO. The samples were container-less processed in an aerodynamic levitation system and crystallization was followed in situ by synchrotron x-ray diffraction at the beamline P21.1 at the German electron synchrotron (DESY). Modification changes of di- and tricalcium silicate were observed and occurred at lower temperatures than under equilibrium conditions. Despite deep sample undercooling, no metastable phase formation was observed within the measurement timescale of 1 s. For the given cooling rates ranging from 300 K s−1 to about 1 K s−1, no decomposition of tricalcium silicate was observed. No differences in phase evolution were observed between reducing and oxidizing conditions imposed by the levitation gas (Ar and Ar + O2). We demonstrate that this setup has great potential to follow crystallization in refractory oxide liquids in situ. For sub-second primary phase formation faster detection and for polymorph detection adjustments in resolution have to be implemented. |
| Databáze: | OpenAIRE |
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