Synthesis of ferrite grade γ-Fe2O3
Source abstract
Abstract
Iron(II) carboxylato-hydrazinates: Ferrous fumarato-hydrazinate (FFH), FeC4H2O4·2N2H4; ferrous succinato-hydrazinate (FSH), FeC4H4O4·2N2H4; ferrous maleato-hydrazinate (FEH), FeC4H2O4·2N2H4; ferrous malato-hydrazinate (FLH), Fein4H4O5·2N2H4; ferrous malonato-hydrazinate (FMH), FeC3H2O4·1.5N2H4·H2O; and ferrous tartrato-hydrazinate (FTH), FeC4H4O6·N2H4·H2O are being synthesized for the first time. These decompose (autocatalytically) in an ordinary atmosphere to mainly γ-Fe2O3, while the unhydrazinated iron(II) carboxylates in air yield α-Fe2O3, but the controlled atmosphere of moisture requires for the oxalates to stabilize the metastable γ-Fe2O3. The hydrazine released during heating reacts with atmospheric oxygen liberating enormous energy, N2H4 + O2 → N2 + H2O; ΔH2O = −621 kJ/mol, which enables to oxidatively decompose the dehydrazinated complex to γ-Fe2O3. The reaction products N2 + H2O provide the necessary atmosphere of moisture needed for the stabilization of the metastable oxide.
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Research context
OpenAlex topics: Thermal and Kinetic Analysis · Magnetic Properties and Synthesis of Ferrites · Iron oxide chemistry and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
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