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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...
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