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Article Abstract
Phase formation and evolution was investigated in the CaO-SiOsystem in the range of 70-80 mol% CaO. The samples were container-less processed in an aerodynamic levitation system and crystallization was followedby 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 sto about 1 K s, 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 + O). We demonstrate that this setup has great potential to follow crystallization in refractory oxide liquids. For sub-second primary phase formation faster detection and for polymorph detection adjustments in resolution have to be implemented.
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