najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2021-12-4-492-504najo-501Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХSynthesis and magnetic properties of cobalt ferrite nanoparticles formed under hydro and solvothermal conditionsСинтез и магнитные свойства наночастиц феррита кобальта, сформированных в гидро- и сольвотермических условияхVasil’evB. V.Vasil’evB. V.

31, Bolshoy pr., 199004 Saint Petersburg;

5, ul. Professora Popova,  197376 Saint Petersburg.

SmyslovR. Yu.SmyslovR. Yu.

31, Bolshoy pr., 199004 Saint Petersburg.

KirilenkoD. A.KirilenkoD. A.

26, Politekhnicheskaya ul., 194021 Saint Petersburg;

49, Kronverskii avenue,  197101 Saint Petersburg.

BugrovA. N.BugrovA. N.

31, Bolshoy pr., 199004 Saint Petersburg;

5, ul. Professora Popova,  197376 Saint Petersburg.

Institute of Macromolecular Compounds RAS; Saint Petersburg Electrotechnical University “LETI”Russian FederationInstitute of Macromolecular Compounds RASRussian FederationIoffe Institute RAS; ITMO UniversityRussian Federation202104082025124492504Copyright © Vasil’ev B.V., Smyslov R.Y., Kirilenko D.A., Bugrov A.N., 20252025Vasil’ev B.V., Smyslov R.Y., Kirilenko D.A., Bugrov A.N.Vasil’ev B.V., Smyslov R.Y., Kirilenko D.A., Bugrov A.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/501

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.

Наночастицы феррита кобальта синтезированы как в гидро-, так и в сольвотермальнойх условиях из солей Co и Fe различной химической природы (нитраты и хлориды), взятых в соотношении катионов 1:2. Варьирование химической предыстории, температуры синтеза, времени изотермической выдержки и состава реакционной среды позволило получить набор наночастиц CoxFe3-xO4 с различным средним диаметром и степенью изоморфного замещения x. Элементный состав, кристаллическую структуру, размеры и магнитные свойства полученных наночастиц определяли с помощью EDX-анализа, рентгеноструктурного анализа, просвечивающей электронной микроскопии и СКВИД-магнитометрии. Рассмотрены температурные зависимости коэрцитивной силы, остаточной намагниченности, прямоугольности как от среднего диаметра, так и от стехиометрии наночастиц. Нанокристаллы CoxFe3-xO4 размером от 11 до 29 нм представляли собой одиночные магнитные домены и проявляли ферримагнитное поведение при комнатной температуре. Магнитожесткие наночастицы с максимальной величиной соотношения Mr/Ms в высокотемпературной области были получены для x = 0.79 при сольвотермальной обработке нитратов кобальта и железа при 250 °С, 7 МПа в течение 10 часов.

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The authors declare that there are no conflicts of interest present.