What is the band gap of Fe3O4 nanoparticles? Is it a semiconductor material or semi-metal?

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Ahmed El Ruby Mohamed

my question is about the Magnetite (Fe3O4) not Hematite (Fe2O3) if you have any idea or sources about it ? many thanks and appreciation for your interest and answer.

Manohar Sehgal

The values of both direct and indirect energy band gap of the Magnetite sample classified as a semiconductor lie in between (0 - 3 eV); being highly dependent on the particle size.

Pls. see Reference: Int. J. Electrochem. Sci., 7 (2012) 5734 – 5745.

Angathevar Veluchamy

What is the band gap of Fe3O4, (mangnetite). Does it belong to direct or indirect semiconductor?

It has better semiconducting properties than gamma Fe2O3.

Hoosien Charkhan

The value of energy band gap of the Fe3O4 < 3 eV

Hoosien Charkhan thank you for your answer. do you know any research article or book discussing this in details ?

Jaime Jiménez

I recommend you the publication of Gobara et. al.

Nanocrystalline spinel ferrite for an enriched production of hydrogen through a solar energy stimulated water splitting process

they report a band gap of 2.84 for the Magnetita

Thank you for your valuable help

Yana Bagbi

The estimated band gap of magnetite NPs we obtained is (2.2 eV) which is slightly higher than the bulk iron oxide (2.0 eV) due to less in size.

I recommended my publication where you can find the band gap of magnetite NPs and the basic concept of direct and indirect band-gap.

https://www.nature.com/articles/s41598-017-03380-x

Article Lead (Pb2+) Adsorption by Monodispersed Magnetite Nanopartic...

Deear Prof. José M. Campiña

Thank you for your valuable answer and recommended article.

Dear Yana Bagbi

Thank you so much for your valuable answer and amazing article

Mihail Iacob

According to De Rochelle M. Cornell,Udo Schwertmann, The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses:

Magnetite can be slightly metal deficient with vacancies on the octahedral sites. It is both an n and a p type semiconductor. The band gap is small (0.1 eV), hence magnetite has the lowest resistivity of any ...

Thank you Mihail for the answer

Mustafa K. Ismael

Hi Dr Ahmed,

As far as I know the band gap of around 0.2 eV at the Fermi level.

And it's chemical compound .

You can see this article :

https://pubs.acs.org/doi/full/10.1021/acs.jpcc.7b09387

Heisemberg Tarazona

I made DFT based calculations on magnetite and I found magnetite (bulk) behaves like a semimetal; i.e., band structures for majority spin (up) have a gap but for minority spin (down) it doesn't have.