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. 2015 May 5;5:9733. doi: 10.1038/srep09733

Table 1. Shape and phase evaluation of different iron oxides.

Precursor Shape As-prepared samples heated 250 °C in argon heated 450 oC in argon heated 450 oC in air TG/DTA recovered sample
Fe(II)sulphate heptahydrate nanorods α-FeOOH + 5Fe2O3.9H2O α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3
Fe(II)oxalate dihydrate nano husks β-FeOOH γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 α-Fe2O3
Fe(III)chloride hexahydrate cubes α-Fe2O3 α-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3
Fe(III)nitrate nonahydrate nanocubes α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3
Fe(II)D gluconate dihydrate porous spheres amorphous amorphous γ-Fe2O3 α-Fe2O3 Fe + γ-Fe2O3
Fe(0)pentacarbonyl self arranged flowers γ-Fe2O3 + oxyhydroxides α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3 α-Fe2O3 + γ-Fe2O3