Iron incorporation into magnesium aluminosilicate glass network under fast laser floating zone processing
authors Ferreira, NM; Kovalevsky, AV; Valente, MA; Sobolev, NA; Waerenborgh, JC; Costa, FM; Frade, JR
nationality International
journal CERAMICS INTERNATIONAL
author keywords Aluminosilicate; Laser floating zone; Iron oxide; Glass electrolyte; Molten oxide electrolysis
keywords SODIUM-SILICATE GLASSES; MOSSBAUER-SPECTROSCOPY; MELTS; OXIDATION; COORDINATION; TEMPERATURE; SYSTEM; METAL
abstract Magnesium aluminosilicate glasses were proposed as molten electrolyte for iron pyroelectrolysis, an alternative electrometallurgical technique offering environmental and economic advantages over traditional steelmaking. This work focuses on mechanisms of iron incorporation in the glass network and related effects on physical properties. The study was performed on amorphous Fe-containing glass fibres, grown by laser floating zone in strongly non-equilibrium conditions, to retain frozen-in states characteristic for glass electrolyte at high temperatures. Up to 4 mol% content the iron cations possess predominantly 2+ oxidation state, act mostly as a network modifier and are distributed as isolated ions in the glass network. Presence of magnetic exchange interactions and paramagnetic resonance signal at g similar to 2.0 in the case of higher iron contents suggest progressive clustering of iron cations. The observed clustering and concomitant increase in the electrical conductivity indicate possible appearance of redox-driven hopping conductivity, acting as an electronic contribution to charge transport. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2016
volume 42
issue 2
beginning page 2693
ending page 2698
digital object identifier (doi) 10.1016/j.ceramint.2015.10.150
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000367277000072
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