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	HH317Script error: No such module "Preview warning".Category:GHS errors, HH330Script error: No such module "Preview warning".Category:GHS errors, HH334Script error: No such module "Preview warning".Category:GHS errors, HH360FScript error: No such module "Preview warning".Category:GHS errors, HH372Script error: No such module "Preview warning".Category:GHS errors
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]

References

↑ PubChem. "Cobalt iron oxide (CoFe2O4)" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/44602546.
↑ 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.
↑ 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.
↑ 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.
↑ 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.
↑ 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.
↑ 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.
↑ 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.
↑ 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.
↑ ^10.0 ^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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[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.

[Ortiz-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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Cobalt ferrite

Topic: Chemistry

Uses

See also

References