Cobalt ferrite

Cobalt ferrite  Names

IUPAC name

cobalt(2+);iron(3+);oxygen(2-)

Identifiers

CAS Number

* 12052-28-7

3D model (JSmol)

* Interactive image

ChemSpider |

* 21241477

EC Number |

* 234-992-3

PubChem CID

* 44602546

InChI

* InChI=1S/Co.2Fe.4O/q+2;2*+3;4*-2

Key: MMOVVVBHLUGHGW-UHFFFAOYSA-N

SMILES

* [O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Co+2]

Properties

Chemical formula

| CoFe2O4
Molar mass | 234.619 g·mol−1
Hazards
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

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GHS precautionary statements

| PP203Script error: No such module "Preview warning".Category:GHS errors, PP233Script error: No such module "Preview warning".Category:GHS errors, PP260Script error: No such module "Preview warning".Category:GHS errors, PP264Script error: No such module "Preview warning".Category:GHS errors, PP270Script error: No such module "Preview warning".Category:GHS errors, PP271Script error: No such module "Preview warning".Category:GHS errors, PP272Script error: No such module "Preview warning".Category:GHS errors, PP280Script error: No such module "Preview warning".Category:GHS errors, PP284Script error: No such module "Preview warning".Category:GHS errors, PP302+P352Script error: No such module "Preview warning".Category:GHS errors, PP304+P340Script error: No such module "Preview warning".Category:GHS errors, PP316Script error: No such module "Preview warning".Category:GHS errors, PP318Script error: No such module "Preview warning".Category:GHS errors, PP319Script error: No such module "Preview warning".Category:GHS errors, PP320Script error: No such module "Preview warning".Category:GHS errors, PP321Script error: No such module "Preview warning".Category:GHS errors, PP333+P317Script error: No such module "Preview warning".Category:GHS errors, PP342+P316Script error: No such module "Preview warning".Category:GHS errors, PP362+P364Script error: No such module "Preview warning".Category:GHS errors, PP403Script error: No such module "Preview warning".Category:GHS errors, PP403+P233Script error: No such module "Preview warning".Category:GHS errors, PP405Script error: No such module "Preview warning".Category:GHS errors, PP501Script error: No such module "Preview warning".Category:GHS errors

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Cobalt ferrite is a semi-hard ferrite with the chemical formula of CoFe2O4 (CoO·Fe2O3). The substance can be considered as between soft and hard magnetic material and is usually classified as a semi-hard material.[2]

## Uses

It is mainly used for its magnetostrictive applications like sensors and actuators [3] thanks to its high saturation magnetostriction (~200 ppm). CoFe2O4 has also the benefits to be rare-earth free, which makes it a good substitute for Terfenol-D.[4] Moreover, its magnetostrictive properties can be tuned by inducing a magnetic uniaxial anisotropy.[5] This can be done by magnetic annealing,[6] magnetic field assisted compaction,[7] or reaction under uniaxial pressure.[8] This last solution has the advantage to be ultra fast (20 min) thanks to the use of spark plasma sintering. The induced magnetic anisotropy in cobalt ferrite is also beneficial to enhance the magnetoelectric effect in composite.[9]

Cobalt ferrite can be also used as electrocatalyst for oxygen evolution reaction and as material for fabricating electrodes for electrochemical capacitors (also named supercapacitors) for energy storage. These uses take advantage of the redox reactions occurring at the surface of the ferrite. Cobalt ferrite prepared with controlled morphology and size to enhance the surface area, and thus the number of active sites, has been published.[10] One disadvantage of the cobalt ferrite for some applications is their low electrical conductivity. Nanostructures of cobalt ferrite with different shape can be synthesized on conducting substrates, such as reduced graphene oxide, to alleviate this disadvantage.[10]

## See also

* Ferrite

## References

1. ↑ PubChem. "Cobalt iron oxide (CoFe2O4)" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/44602546.
2. ↑ Hosni (2016). "Semi-hard magnetic properties of nanoparticles of cobalt ferrite synthesized by the co-precipitation process". Journal of Alloys and Compounds 694: 1295–1301. doi:10.1016/j.jallcom.2016.09.252.
3. ↑ Olabi (2008). "Design and application of magnetostrictive materials". Materials & Design 29 (2): 469–483. doi:10.1016/j.matdes.2006.12.016. http://doras.dcu.ie/15063/1/Olabi-MS-paper-12-09-06.pdf.
4. ↑ Sato Turtelli (2014). "Co-ferrite – A material with interesting magnetic properties". IOP Conference Series: Materials Science and Engineering 60 (1). doi:10.1088/1757-899X/60/1/012020. Bibcode: 2014MS&E...60a2020T.
5. ↑ J. C. Slonczewski (1958). "Origin of Magnetic Anisotropy in Cobalt-Substituted Magnetite". Physical Review 110 (6): 1341–1348. doi:10.1103/PhysRev.110.1341. Bibcode: 1958PhRv..110.1341S.
6. ↑ Lo (2005). "Improvement of magnetomechanical properties of cobalt ferrite by magnetic annealing". IEEE Transactions on Magnetics 41 (10): 3676–3678. doi:10.1109/TMAG.2005.854790. Bibcode: 2005ITM....41.3676L.
7. ↑ Wang (2015). "Magnetostriction properties of oriented polycrystalline CoFe2O4". Journal of Magnetism and Magnetic Materials 401: 662–666. doi:10.1016/j.jmmm.2015.10.073.
8. ↑ Aubert, A. (2017). "Uniaxial anisotropy and enhanced magnetostriction of CoFe2O4 induced by reaction under uniaxial pressure with SPS". Journal of the European Ceramic Society 37 (9): 3101–3105. doi:10.1016/j.jeurceramsoc.2017.03.036. https://hal.archives-ouvertes.fr/hal-01636264.
9. ↑ Aubert, A. (2017). "Enhancement of the Magnetoelectric Effect in Multiferroic CoFe2O4/PZT Bilayer by Induced Uniaxial Magnetic Anisotropy". IEEE Transactions on Magnetics 53 (11): 1–5. doi:10.1109/TMAG.2017.2696162. Bibcode: 2017ITM....53A6162A. https://hal.archives-ouvertes.fr/hal-01636268.
10. ↑ 10.0 10.1 Ortiz-Quiñonez, Jose-Luis; Das, Sachindranath; Pal, Umapada (October 2022). "Catalytic and pseudocapacitive energy storage performance of metal (Co, Ni, Cu and Mn) ferrite nanostructures and nanocomposites". Progress in Materials Science 130. doi:10.1016/j.pmatsci.2022.100995.

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*[CID]: Compound ID