2009/07/01 by Jun Kikuma, Masamichi Tsunashima, Tetsuji Ishikawa +4 · 1 citation
Materials Science · Engineering · Chemistry · #Clay minerals and soil interactions #Nuclear materials and radiation effects #Metal Extraction and Bioleaching #Tobermorite #Autoclave #Hydrothermal circulation #Materials science #Diffraction #X-ray crystallography #Atmospheric temperature range #Beryllium #Hydrothermal synthesis #Chemical engineering #Synchrotron #Mineralogy #Crystallography #Chemistry #Analytical Chemistry (journal) #Cement #Composite material #Optics #Metallurgy #Thermodynamics
paper · pdf · doi:10.1107/s0909049509022080
openalex publication_date 2009/07/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Hydrothermal formation of tobermorite from a pre-cured cake has been investigated by transmission X-ray diffraction (XRD) using high-energy X-rays from a synchrotron radiation source in combination with a newly designed autoclave cell. The autoclave cell has a large and thin beryllium window for wide-angle X-ray diffraction; nevertheless, it withstands a steam pressure of more than 1.2 MPa, which enables in situ XRD measurements in a temperature range of 373 to 463 K under a saturated steam pressure. Formation and/or decomposition of several components has been successfully observed during 7.5 h of reaction time. From the intensity changes of the intermediate materials, namely non-crystalline C-S-H and hydroxylellestadite, two pathways for tobermorite formation have been confirmed. Thus, the newly developed autoclave cell can be used for the analyses of reaction mechanisms under specific atmospheres and temperatures.