2 Fe 3 O 4 ⏞ The Domain + 1 2 O 2 ⟶ 3 ( λ − Fe 2 O 3 ) ⏞ maghemite 2 Fe 3 O 4 ⏟ magnetite + 1 2 O 2 ⟶ 3 ( α − Fe 2 O 3 ) ⏟ hematite {\displaystyle {\begin{aligned}\overbrace {{\ce {2Fe3O4}}} ^{\text{The Domain}}+{\ce {1/2 O2 ->}}\ &{\color {Brown}\overbrace {{\ce {3(\lambda{-}Fe2O3)}}} ^{\text{maghemite}}}\\\underbrace {{\ce {2Fe3O4}}} _{\text{magnetite}}+{\ce {1/2 O2 ->}}\ &{\color {Red}\underbrace {{\ce {3(\alpha{-}Fe2O3)}}} _{\text{hematite}}}\end{aligned}}}