@article{151303f0a810480785a66ebc361019bb,
title = "Molecular structure of CaO–FeOx–SiO2 glassy slags and resultant inorganic polymer binders",
abstract = "The molecular structures of CaO–FeOx–SiO2 slags and their inorganic polymer counterparts were determined using neutron and X-ray scattering with subsequent pair distribution function (PDF) analysis. The slags were synthesized with approximate molar compositions: 0.17CaO–0.83FeO–SiO2 and 0.33CaO–0.67FeO–SiO2 (referred to as low-Ca and high-Ca, respectively). The PDF data on the slags reasserted the predominantly glassy nature of this iron-rich industrial byproduct. The dominant metal-metal correlation was Fe–Si (3.20-3.25 {\AA}), with smaller contributions from Fe–Ca (3.45-3.50 {\AA}) and Fe–Fe (2.95-3.00 {\AA}). After inorganic polymer synthesis, a rise in the amount of Fe3+ was observed via the shift of the Fe–O bond length to shorter distances. This shortening of the Fe–O distance in the binder is also evidenced by the apparent rise of the Fe–Fe correlation at 2.95-3.00 {\AA}, although this feature may also suggest a potential aggregation of FeOx clusters. In general, the atomic arrangements of the reaction product was shown to be very similar to the precursor structure and the dominance of the Fe–Si correlation suggests the participation of Fe in the silicate network. The binder was shown to be glassy, as no distinct atom-atom correlations were observed beyond 8 {\AA}.",
keywords = "alkali-activated materials, inorganic polymers, iron silicate, pair distribution function analysis, silicate glass",
author = "Arne Peys and White, {Claire Emily} and Daniel Olds and Hubert Rahier and Bart Blanpain and Yiannis Pontikes",
note = "Funding Information: AP is thankful to the Research Foundation—Flanders (FWO) for the FWO-SB scholarship and additional funding for international mobility. CEW was supported by the National Science Foundation under Grant No. 1362039. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (ORNL). Use of the Advanced Photon Source (APS), an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. The authors thank the staff at ORNL and the APS for the support in the experiments. Special thanks goes out to Katharine Page (ORNL) and Olaf Borkiewicz (APS) for measuring the samples and initial data reduction. Funding Information: AP is thankful to the Research Foundation—Flanders (FWO) for the FWO‐SB scholarship and additional funding for international mobility. CEW was supported by the National Science Foundation under Grant No. 1362039. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (ORNL). Use of the Advanced Photon Source (APS), an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE‐AC02‐06CH11357. The authors thank the staff at ORNL and the APS for the support in the experiments. Special thanks goes out to Katharine Page (ORNL) and Olaf Borkiewicz (APS) for measuring the samples and initial data reduction. Publisher Copyright: {\textcopyright} 2018 The American Ceramic Society",
year = "2018",
month = dec,
doi = "10.1111/jace.15880",
language = "English (US)",
volume = "101",
pages = "5846--5857",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "12",
}