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Inorganic polymers made of fayalite slag: On the microstructure and behavior of Fe
Author(s) -
Onisei Silviana,
Douvalis Alexios P.,
Malfliet Annelies,
Peys Arne,
Pontikes Yiannis
Publication year - 2018
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/jace.15420
Subject(s) - fayalite , slag (welding) , amorphous solid , silicate , microstructure , phase (matter) , materials science , chemical engineering , polymer , sodium silicate , chemistry , inorganic chemistry , metallurgy , mineralogy , olivine , composite material , crystallography , organic chemistry , engineering
Abstract The microstructure of inorganic polymers ( IP ) formed from fayalite slag was investigated as a function of the composition of different activating solutions. The starting slag was 80 wt% amorphous, and after activation using sodium silicate solutions with varying SiO 2 /Na 2 O molar ratios, the amorphous phase dissolved and a binder phase was formed. The morphology of this binder, including the population and size of remnant particles and pores, was dependent on the particular activating solution used, and became denser as the level of silicate rose. 57 Fe Mössbauer spectroscopy revealed that the IP synthesis reaction is combined with the oxidation of Fe 2+ from the fayalite slag to Fe 3+ in the inorganic polymer binder. The reaction extent varied and could be quantified using the absorption areas of these ions. Data corroborate that the Fe 2+ ions in the amorphous part of the fayalite slag and the Fe 3+ ions in the new binder phase had an average oxygen‐coordination number of 5.