Comparative study on the chemical stability of Fe 3 O 4 and NiFe 2 O 4 in molten salts

Tests on NixFe3−xO4 spinels, considered as promising materials in the aluminium production, were performed on Fe3O4 and NiFe2O4. First, FeAl2O4 aluminate was spontaneously formed by Fe3O4 immersion at 960 °C, due to Fe3+/Al3+ substitution into the spinel structure. Then, stability of aluminate compo...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2018-02, Vol.228
Main Authors: Meyer, Pauline, Gibilaro, Mathieu, Massot, Laurent, Pasquet, Isabelle, Tailhades, Philippe, Bouvet, S., Chamelot, Pierre
Format: Article
Language:English
Subjects:
Chemical Sciences
Engineering Sciences
Material chemistry
Materials
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Tests on NixFe3−xO4 spinels, considered as promising materials in the aluminium production, were performed on Fe3O4 and NiFe2O4. First, FeAl2O4 aluminate was spontaneously formed by Fe3O4 immersion at 960 °C, due to Fe3+/Al3+ substitution into the spinel structure. Then, stability of aluminate compound was investigated into cryolite melt and results showed a rapid dissolution when the aluminate composition tends to FeAl2O4. Kinetic studies demonstrated that the spinel dissolution was around twentyfold higher than aluminate formation, confirming the micrographic observation. To prevent it, nickel was added in the spinel structure up to NiFe2O4 and no dissolution was observed.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2017.11.025