TY - JOUR
T1 - Fe speciation in geopolymers with Si/Al molar ratio of ~2
AU - Perera, Dan S
AU - Cashion, John Dixon
AU - Blackford, Mark G
AU - Zhang, Zhaoming
AU - Vance, Eric
PY - 2007
Y1 - 2007
N2 - The speciation of Fe was studied in metakaolin-based geopolymers to which Fe was added as ferric nitrate solution or freshly precipitated ferric hydroxide. From Mossbauer and near-edge X-ray absorption spectroscopies, coupled with X-ray diffraction and electron microscopy, it was concluded that in as-cured geopolymers the Fe was present in octahedral sites, either as isolated ions in the geopolymer matrix or as oxyhydroxide aggregates which had not reacted with the starting geopolymer components. For material to which iron nitrate was added, heating to 900 degrees C allowed the formation of nepheline and a glass, both of which contained tetrahedrally coordinated, substituted Fe3+. Crown Copyright (c) 2006 Published by Elsevier Ltd. All rights reserved.
AB - The speciation of Fe was studied in metakaolin-based geopolymers to which Fe was added as ferric nitrate solution or freshly precipitated ferric hydroxide. From Mossbauer and near-edge X-ray absorption spectroscopies, coupled with X-ray diffraction and electron microscopy, it was concluded that in as-cured geopolymers the Fe was present in octahedral sites, either as isolated ions in the geopolymer matrix or as oxyhydroxide aggregates which had not reacted with the starting geopolymer components. For material to which iron nitrate was added, heating to 900 degrees C allowed the formation of nepheline and a glass, both of which contained tetrahedrally coordinated, substituted Fe3+. Crown Copyright (c) 2006 Published by Elsevier Ltd. All rights reserved.
UR - http://www.sciencedirect.com/science/article/pii/S0955221906005644
U2 - 10.1016/j.jeurceramsoc.2006.10.006
DO - 10.1016/j.jeurceramsoc.2006.10.006
M3 - Article
VL - 27
SP - 2697
EP - 2703
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 7
ER -