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Эта публикация цитируется в 2 научных статьях (всего в 2 статьях)
CHEMISTRY AND MATERIAL SCIENCE
Synthesis and magnetic properties of cobalt ferrite nanoparticles formed under hydro and solvothermal conditions
B. V. Vasil'evab, R. Yu. Smyslova, D. A. Kirilenkocd, A. N. Bugrovab a Institute of Macromolecular Compounds RAS, Bolshoy pr. 31, 199004 Saint Petersburg, Russia
b Saint Petersburg Electrotechnical University "LETI", ul. Professora Popova 5, 197376 Saint Petersburg, Russia
c Ioffe Institute RAS, Politekhnicheskaya ul. 26, 194021 Saint Petersburg, Russia
d ITMO University, Kronverskii avenue 49, 197101 Saint Petersburg, Russia
Аннотация:
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 Co$_x$Fe$_{3-x}$O$_4$ 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. Co$_x$Fe$_{3-x}$O$_4$ 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$^\circ$C, 7 MPa for 10 hours.
Ключевые слова:
single-domain cobalt ferrite, ferrimagnetic nanocrystals, size-controlled synthesis, stoichiometry, Rietveld refinement, coercive field, saturation magnetization, squareness.
Поступила в редакцию: 19.10.2020 Исправленный вариант: 09.08.2021
Образец цитирования:
B. V. Vasil'ev, R. Yu. Smyslov, D. A. Kirilenko, A. N. Bugrov, “Synthesis and magnetic properties of cobalt ferrite nanoparticles formed under hydro and solvothermal conditions”, Наносистемы: физика, химия, математика, 12:4 (2021), 492–504
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/nano1044 https://www.mathnet.ru/rus/nano/v12/i4/p492
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