Molecular structure of CaO–FeO x –SiO 2 glassy slags and resultant inorganic polymer binders

Peys, Arne; White, Claire E.; Olds, Daniel; Rahier, Hubert; Blanpain, Bart; Pontikes, Yiannis

doi:10.1111/jace.15880

Title: Molecular structure of CaO–FeO _x –SiO ₂ glassy slags and resultant inorganic polymer binders

Journal Article · Thu Jun 28 00:00:00 EDT 2018 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15880· OSTI ID:1457596

^[1];

^[2]; Olds, Daniel ^[3]; Rahier, Hubert ^[4]; Blanpain, Bart ^[5]; Pontikes, Yiannis ^[5]

KU Leuven Department of Materials Engineering Leuven Belgium, Department of Civil and Environmental Engineering Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey
Department of Civil and Environmental Engineering Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey
Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee
Department of Materials and Chemistry Vrije Universiteit Brussel Brussels Belgium
KU Leuven Department of Materials Engineering Leuven Belgium

Abstract The molecular structures of CaO–FeO _x –SiO ₂ 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–SiO ₂ and 0.33CaO–0.67FeO–SiO ₂ (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 Å), with smaller contributions from Fe–Ca (3.45‐3.50 Å) and Fe–Fe (2.95‐3.00 Å). After inorganic polymer synthesis, a rise in the amount of Fe ³⁺ 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 Å, although this feature may also suggest a potential aggregation of FeO _x 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 Å.

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Sponsoring Organization:: USDOE

OSTI ID:: 1457596

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 101 Journal Issue: 12; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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