Open AccessIn situ synchrotron XRD measurements during solidification of a melt in the CaO–SiO2 system using an aerodynamic levitation system
Author(s) -
Katharina Schraut,
Florian Kargl,
Christian Adam,
Oleh Ivashko
Publication year - 2021
Publication title -
journal of physics. condensed matter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 228
eISSN - 1361-648X
pISSN - 0953-8984
DOI - 10.1088/1361-648x/abf7e1
Subject(s) - synchrotron , crystallization , materials science , levitation , analytical chemistry (journal) , phase (matter) , metastability , silicate , supercooling , thermodynamics , chemical engineering , chemistry , magnet , optics , physics , organic chemistry , chromatography , quantum mechanics , engineering
Phase formation and evolution was investigated in the CaO–SiO 2 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 + O 2 ). 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.