Systematic comparison of Mg K-edge XANES spectra of magnesium-bearing clay minerals and magnesium silicate hydrates: A promising tool for identifying magnesium silicate hydrate in natural samples

Mineralogical Evolution of High-pH/Low-pH Cement Pastes in Contact with Seawater

“…The shift occurred at L/S >100 for the OPC pastes and L/S > 10 for the LAC pastes and was assumed to be caused by the dissolution of C-S-H and the formation of M-S-H as a secondary product. M-S-H structures were reported to have either a serpentine-like 1:1 type structure with tetrahedral and octahedral sheets combined 1:1 (T-O layer), or a talc-like 2:1 type structure with octahedral sheets sandwiched between tetrahedral sheets (T-O-T layer) [28,[45][46][47]. The peak positions of M-S-H identified in the immersed samples were consistent with the serpentine group (around 680 cm −1 ) for the OPC pastes and talc (around 670 cm −1 ) for the LAC pastes, indicating that the formed structure of M-S-H was different depending on the type of cement.…”

Characterization of hydrated magnesium carbonate materials with synchrotron radiation-based scanning transmission X-ray spectromicroscopy

“…Magnesium K-edge XANES has been extensively reported in various Mg-based minerals and carbonates. 22–25 Although Mg K-edge XANES is very sensitive to the chemical environment and coordination of the absorbing Mg atom, the current available literature is limited when it comes to STXM-XANES studies. As for MgO-based binders, the formation of MgO from the dehydration of Mg(OH) 2 was studied by Yoshida et al 22 using Mg K-edge XANES at the UVSOR synchrotron in Japan.…”