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Iron oxide is the chemical compound with formula Fe3O4. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron oxide, which is rare, and iron oxide also known as hematite. It contains both Fe2+ and Fe3+ ions and is sometimes formulated as FeO ∙ Fe2O3. This iron oxide is encountered in the laboratory as a black powder. It exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic. Its most ... 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (1) why the there is Fe3O4 in the above equation and why not Fe2O3 (2)kindely explain me how we came to this equation (2)(a) What is the equation for the reaction of calcium and potassium in water?
Int. J. Nanosci. Nanotechnol., Vol. 9, No. 4, Dec. 2013, pp. 193-202 TiO2/Fe3O4 Nanocomposite Photocatalysts for Enhanced Photo-Decolorization of Congo Red Dye A. Banisharif1, S. Hakim Elahi1, A. Anaraki Firooz2, A. A. Khodadadi1*, Y. Mortazavi1 1- Catalysis and Nanostrucured Materials Research Laboratory, School of Chemical Engineering, University of Tehran, Tehran, I. R. Iran 2- Department ... Formula unit – 7. Ionic compound – 8. Law of multiple proportions – 9. Law of definite proportions – 10. Molecular compound – 11. Molecular formula – 12. Molecule – 13. Monatomic ion – 14. Polyatomic ion – 15. Ternary compound – 16. Explain what a polyatomic ion is: 17. Write the formulas for the following compounds: a. Fe3O4 nanoparticles were used in hyperthermia treatment, magnetic fluid recordings and catalysis. In this present study, we have synthesized nanocomposites consisting of 1.25% Ce doped HAP with various concentrations of Fe3O4 NPs as 90:10 (C-1), 70:30 (C-2) and 50:50 wt% (C-3) using ball milling technique.
A LiFePO4/Fe3O4-rGO cell is constructed and capable of delivering an energy density of approximately 139 Wh kg−1 with a notable cyclability (ca. 76 %) after 500 cycles. Prior to the fabrication of a LIB, the Fe3O4-rGO is electrochemically pretreated to eliminate the irreversible capacity loss.