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Extended X‐ray Absorption Fine Structure Investigation of Calcium Silicate Hydrates
Author(s) -
Lequeux Nicolas,
Morau Alain,
Philippot Samuel,
Boch Philippe
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01911.x
Subject(s) - tobermorite , extended x ray absorption fine structure , calcium silicate , wollastonite , silicate , calcium , crystallography , materials science , absorption (acoustics) , chemistry , mineralogy , analytical chemistry (journal) , absorption spectroscopy , organic chemistry , optics , metallurgy , composite material , raw material , physics , cement
29 Si MAS‐NMR, and Ca‐EXAFS experiments have been conducted on calcium silicate hydrates (C‐S‐Hs) with structure derived from wollastonite. Crystalline compounds (wollastonite, xonotlite, hillebrandite, foshagite, 1.1 nm and 1.4 nm tobermorites, and jennite) and C‐S‐H were synthesized and characterized. 29 Si NMR provides information on silicate chains and EXAFS on calcium environment. The refined EXAFS values are in agreement with XRD data, except for tobermorite. The calcium order in C‐S‐H (C/S molar ratio from 0.7 to 1.4) is similar to that of tobermorite but different from that of jennite. Structural models of C‐S‐H are discussed.