What is the magnetic nature of Fe3O4?

What is the magnetic nature of Fe3O4?

The magnetic interaction among iron ions at octahedral and tetrahedral sites is antiferromagnetic and that among octahedral ions is ferromagnetic; overall a ferrimagnetic arrangement of Fe3O4. Therefore, the net magnetic moment in Fe3O4 is due to Fe2+ ions (4 μB).

Is Fe3O4 superparamagnetic?

The lowremnant magnetization (value of magnetization at zero field strength) and the coercivity field (value of reverse field required to return the material to zero magnetization state) reveal that prepared Fe3O4 NPs possess a superparamagnetic behavior at room temperature [40], [41].

How do you make Fe3O4 nanoparticles?

Fe3O4 magnetic nanoparticles (MNPs) were synthesized by a co-precipitation method using sodium citrate and oleic acid as modifiers. Phase composition and microstructure analysis indicate that the sodium citrate and oleic acid have been successfully grafted onto the surface of Fe3O4 MNPs.

Is iron oxide a nanoparticle?

Iron oxide (IO) nanoparticles consist of maghemite (γ-Fe2O3) and/or magnetite (Fe3O4) particles with diameters ranging from 1 and 100 nanometer and find applications in magnetic data storage, biosensing, drug-delivery etc. This property provides additional stability for magnetic nanoparticles in solutions.

Is Fe3O4 electrically conductive?

It is very easy. Magnetite Fe3O4 is a famous material with a metal-insuator transition at T = 120 K. So at room temperature Fe3O4 is a conductor whereas at temperature below 120 K it is an insulator.

Is Fe3O4 toxic?

Conclusion: Based on the results obtained by us, Fe3O4 NP exposure, compared to the control, induced inflammatory response, the cytotoxic damage and respiratory toxicity. The results further show that Fe3O4 NP, 28 days after i.v. instillation, were eliminated from the respiratory tract by defense mechanisms.

Is Fe2O3 electrically conductive?

(1) The temperature dependence of electrical conductivity shows that the electrical conductivity of sintered – Fe2O3 at 500 C is three orders of magnitude higher than that of RT.

Is magnetite a good conductor?

Magnetite is unusual in that it can be both a conductor of electricity at higher temperatures and a strong insulator at low temperatures. “At low temperatures, minus 150 degrees, the material becomes an insulator.

How do you convert Fe2O3 to Fe3O4?

Theoretically, Fe2O3 the in system can be converted into Fe3O4 completely by adding Fe with only 8.75% Fe2O3 (mass fraction). That is to say, a small amount of Fe powder can make Fe2O3 transform into Fe3O4 completely in alkaline aqueous solution.