najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2021-12-4-481-491najo-496Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХStudy of magnetic and optical transitions in MFe2O4 (M=Co, Zn, Fe, Mn) with spinel structureИсследование магнитных и оптических переходов в MFe2O4 (M=Co, Zn, Fe, Mn) со структурой шпинелиNitikaNitika.

Delhi NCR, Sonepat, 131029.

nitika270593@gmail.comRanaAnuRanaAnu

Delhi NCR, Sonepat, 131029.

KumarVinodKumarVinod

Dwarka, New Delhi, 110078.

Department of Physics, SRM UniversityIndiaDepartment of Physics, NSUTIndia202104082025124481491Copyright © Nitika .., Rana A., Kumar V., 20252025Nitika .., Rana A., Kumar V.Nitika .., Rana A., Kumar V.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/496

Spinel ferrite (MFe2O4) nanoparticles were successfully synthesized by the coprecipitation method. X-ray diffraction technique was employed for structural analysis. Single-phase cubic spinel structure with an average crystallite size ranging from 5 – 20 nm was obtained for the prepared ferrites. The Fourier transform infrared spectra exhibits an absorption band at 550 cm−1, which is attributed to metal-oxygen bond vibrations at tetrahedral sites. The thermogravimetric analysis revealed the instability of MnFe2O4 and Fe3O4 above 500 ◦C whereas CoFe2O4 is found to be the most stable ferrite. The hysteresis parameters demonstrate the superparamagnetic nature of the prepared nanoparticles with low coercivity except for CoFe2O4. The direct optical band gap energy derived from UV-visible spectra is calculated to be 2.82, 2.83, 2.81, and 2.44 eV for M=Co, Zn, Fe, and Mn respectively. The magnetic and optical properties show a strong dependence on cation site occupancy.

Методом соосаждения синтезированы наночастицы феррита шпинели (MFe2O4). Для структурного анализа использовали метод рентгеновской дифракции. Для полученных ферритов наблюдалась однофазная кубическая структура шпинели со средним размером кристаллитов 5‒20 нм. Инфракрасные спектры с преобразованием Фурье демонстрируют полосу поглощения при 550 см-1, которая приписывается колебаниям связи металл-кислород в тетраэдрических позициях. Термогравиметрический анализ показал нестабильность MnFe2O4 и Fe3O4 выше 500 °C, тогда как CoFe2O4 оказался наиболее стабильным ферритом. Параметры гистерезиса демонстрируют суперпарамагнитную природу полученных наночастиц с низкой коэрцитивной силой, за исключением CoFe2O4. Прямая оптическая ширина запрещенной зоны, полученная из УФ-видимых спектров, рассчитана как 2.82, 2.83, 2.81 и 2.44 эВ для M = Co, Zn, Fe и Mn соответственно. Магнитные и оптические свойства сильно зависят от занятости позиций катионов.

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