Geodesic
Study of magnetic and optical transitions in MFe$_2$O$_4$ (M = Co, Zn, Fe, Mn) with spinel structure
Nanosistemy: fizika, himiâ, matematika, Tome 12 (2021) no. 4, pp. 481-491.

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Spinel ferrite (MFe$_2$O$_4$) 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 MFe$_2$O$_4$ and Fe$_3$O$_4$ above 500$^\circ$ C whereas CoFe$_2$O$_4$ is found to be the most stable ferrite. The hysteresis parameters demonstrate the superparamagnetic nature of the prepared nanoparticles with low coercivity except for CoFe$_2$O$_4$. 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.
Keywords: Spinel ferrites, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, hysteresis curve, optical properties. 
@article{NANO_2021_12_4_a9,
     author = {Nitika and Anu Rana and Vinod Kumar},
     title = {Study of magnetic and optical transitions in {MFe}$_2${O}$_4$ {(M} = {Co,} {Zn,} {Fe,} {Mn)} with spinel structure},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {481--491},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2021_12_4_a9/}
}
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Nitika; Anu Rana; Vinod Kumar. Study of magnetic and optical transitions in MFe$_2$O$_4$ (M = Co, Zn, Fe, Mn) with spinel structure. Nanosistemy: fizika, himiâ, matematika, Tome 12 (2021) no. 4, pp. 481-491. http://geodesic.mathdoc.fr/item/NANO_2021_12_4_a9/