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