Synthesis and magnetic properties of cobalt ferrite nanoparticles formed under hydro and solvothermal conditions
https://doi.org/10.17586/2220-8054-2021-12-4-492-504
Abstract
Cobalt ferrite nanoparticles were synthesized both in hydro and in solvothermal conditions from Co and Fe salts of different chemical nature (nitrates and chlorides) taken in a 1:2 cation ratio. Varying the chemical prehistory, synthesis temperature, isothermal holding time, and the reaction medium composition made it possible to obtain a set of CoxFe3−xO4 nanoparticles of different average diameters and isomorphic substitution degree x. The resulting nanoparticles’ elemental composition, crystal structure, sizes, and magnetic properties were determined using EDX analysis, X-ray diffraction, transmission electron microscopy, and SQUID magnetometry. The temperature dependences of the coercivity, remanent magnetization, squareness on both the average diameter and the stoichiometry of nanoparticles are considered. CoxFe3−xO4 nanocrystals ranged from 11 to 29 nm were single magnetic domains and showed ferrimagnetic behavior at room temperature. The hardest magnetic nanoparticles with maximum squareness values in the high-temperature region were formed with x = 0.79 using solvothermal treatment of cobalt and iron nitrates at 250 ◦C, 7 MPa for 10 hours.
Keywords
single-domain cobalt ferrite,
ferrimagnetic nanocrystals,
size-controlled synthesis,
stoichiometry,
Rietveld refinement,
coercive field,
saturation magnetization,
squareness
Supporting agencies: X-ray diffraction experiments were performed on the Engineering Center equipment of the St. Petersburg State Technological Institute (Technical University). TEM studies were carried out in the Federal Joint Research Center “Material science and characterization in advanced technology” funded by the Ministry of Education and Science of the Russian Federation.
About the Authors
B. V. Vasil’ev
Institute of Macromolecular Compounds RAS; Saint Petersburg Electrotechnical University “LETI”
Russian Federation
Russian Federation
31, Bolshoy pr., 199004 Saint Petersburg;
5, ul. Professora Popova, 197376 Saint Petersburg.
R. Yu. Smyslov
Institute of Macromolecular Compounds RAS
Russian Federation
Russian Federation
31, Bolshoy pr., 199004 Saint Petersburg.
D. A. Kirilenko
Ioffe Institute RAS; ITMO University
Russian Federation
Russian Federation
26, Politekhnicheskaya ul., 194021 Saint Petersburg;
49, Kronverskii avenue, 197101 Saint Petersburg.
A. N. Bugrov
Institute of Macromolecular Compounds RAS; Saint Petersburg Electrotechnical University “LETI”
Russian Federation
Russian Federation
31, Bolshoy pr., 199004 Saint Petersburg;
5, ul. Professora Popova, 197376 Saint Petersburg.
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Review
For citations:
Vasil’ev B.V., Smyslov R.Yu., Kirilenko D.A., Bugrov A.N. Synthesis and magnetic properties of cobalt ferrite nanoparticles formed under hydro and solvothermal conditions. Nanosystems: Physics, Chemistry, Mathematics. 2021;12(4):492-504. https://doi.org/10.17586/2220-8054-2021-12-4-492-504
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