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Can authors ensure the percentage or mole proportion FeO and Fe2O3 in Fe3O4? It may not be as per proportion of Fe(II) and Fe(III) salts addition as the solubility of Fe(II) hydroxide is much higher than the Fe(III) hydroxide.

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But how are you sure about that your Fe3O4 particles have the right stoichiometry and the proper cation distribution over A and B site? Please discuss and provide evidence that you have proper Fe3O4 as you report/claim.

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