vestichИзвестия Национальной академии наук Беларуси. Серия химических наукProceedings of the National Academy of Sciences of Belarus, Chemical Series1561-83312524-2342The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8331-2018-54-4-406-412vestich-351Research ArticleФИЗИЧЕСКАЯ ХИМИЯPHYSICAL CHEMISTRYСинтез наноразмерных кобальт-цинковых ферритов методом низкотемпературного распыления с последующим термолизомSynthesis of nano-dimensional cobalt-zinc ferrites by the low-temperature spray-drying with subsequent thermolysisПетроваЕ. Г.PetrovaE. G.

ассистент

Assistant Lecturer

petrovaeg@bsu.byШавшуковаЯ. А.ShavshukovaYa. A.

студент

Graduate Student

shavshukova.yana@mail.ruКотиковД. А.KotsikauD. A.

канд. хим. наук, доцент

Ph. D. (Chemistry), Associate Professor

kotsikau@bsu.byЛазневК. В.LaznevK. V.

аспирант

Postgraduate Student

kvlaznev@mail.ruПаньковВ. В.PankovV V.

д-р хим. наук, профессор, зав. кафедрой физической химии

D. Sc. (Сhemistry), Professor, Head of the Department

pankov@bsu.byБелорусский государственный университет, МинскBelarusian State University, MinskИнститут химии новых материалов Национальной академии наук Беларуси, МинскInstitute of Chemistry of New Materials of the National Academy of Sciences of Belarus, Minsk201812012019544406412Copyright © Петрова Е.Г., Шавшукова Я.А., Котиков Д.А., Лазнев К.В., Паньков В.В., 20192019Петрова Е.Г., Шавшукова Я.А., Котиков Д.А., Лазнев К.В., Паньков В.В.Petrova E.G., Shavshukova Y.A., Kotsikau D.A., Laznev K.V., Pankov V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestichem.belnauka.by/jour/article/view/351

Наночастицы состава Co0,65Zn0,35Fe2O4 получали методом распылительной сушки на воздухе в присутствии NaCl из раствора нитратов, а также из суспензии предварительно осажденных частиц. Полученные прекурсоры подвергали термообработке в диапазоне 300–900 °С в матрице инертного компонента с целью увеличения степени кристалличности без существенного роста размеров наночастиц. Микроструктуру, морфологию и магнитные свойства наночастиц исследовали методами РФА, ИК-спектроскопии, ПЭМ/СЭМ и магнитометрии. При получении ферритов из растворов солей происходит частичное окисление ионов Co2+ до Co3+, что приводит к образованию двух шпинельных фаз – феррита и кобальтита. С ростом температуры обжига доля кобальтита снижается, а феррита – растет. При распылении и последующем обжиге суспензий наночастиц формирования фазы кобальтита не происходит. Повышение температуры термообработки приводит к частичной рекристаллизации частиц и упорядочиванию кристаллической структуры феррита, что вызывает рост удельной намагниченности материалов: от 32,79 Ам2 кг–1 (до обжига) до 91,3 Ам2 кг–1 (обжиг при 900 °С). При этом средний диаметр наночастиц после термообработки не превышает 100 нм.

Co0,65Zn0,35Fe2O4 nanoparticles were produced by spray-drying in air in presence of NaCl from the solution of nitrates, as well as from the suspension of coprecipitated particles. The precursors obtained were annealed at 300–900 °C in the matrix of the inert component in order to increase the crystallinity degree without substantial increase of the nanoparticle size. Microstructure, morphology and magnetic properties of nanoparticles were studied by XRD, FT-IR spectroscopy, TEM / SEM and magnetometry. For the ferrites obtained from nitrate solutions partial oxidation of Co2+ ions to Co3+ occurs, which leads to the formation of two spinel phases, ferrite and cobaltite. With the increase of annealing temperature the content of cobaltite decreases and content of ferrite increases. No cobaltite formation was observed for annealing the spray-dried suspension. An increase in the temperature of the heat treatment leads to partial recrystallization of the particles and the ordering of the ferrite crystal structure, which causes an increase in the specific magnetization of the materials: from 32.8 emu/g (before annealing) to 91.3 emu/g (annealing at 900 ° C). The average diameter of nanoparticles after heat treatment does not exceed 100 nm.

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