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The sol-gel method was employed to synthesize nanocrystalline Zn1-xMnxFe2O4 ferrite samples, with x values of 0.2, 0.4, 0.6, and 0.8. Characterization of these samples was conducted using X-ray diffraction (XRD). The results of Rietveld refinement clearly indicated a single-phase cubic structure. The presence of nanoparticles was evident from the broad peak, and the Debye-Scherrer formula was applied to compute the crystallite size, confirming the nano-scale nature of the prepared samples. Field Emission Scanning Electron Microscopy (FESEM) was employed for surface morphological analysis across all samples, revealing their well-prepared spherical nature. Fourier Transform Infrared Rays (FTIR) Spectroscopy confirmed the presence of distinct chemical bonds. The significance of ZnFe2O4 ferrites lies in their diverse biomedical and technological applications, including biosensors, magnetic separation, targeted drug delivery, magnetic resonance imaging (MRI), and magnetic hyperthermia. [ABSTRACT FROM AUTHOR]

Nanoparticles of Fe3O4 were synthesized employing a wet chemical procedure, succeeded by compacting into pellets. Diverse particle dimensions were achieved via vacuum sintering of pellets at 800°C, with durations of 4 hours and 24 hours respectively. The exploration encompassed a thorough analysis of the magnetic attributes through temperature, field, and time-dependent magnetization measurements. Measurements were executed within the magnetic fields up to 7.5 kOe. Structural aspects of polyhedral Fe3O4 particles were scrutinized via X-ray Diffraction (XRD) patterns, with determination of crystallite size and. Furthermore, in-situ chemical analysis was facilitated through an energy-dispersive X-ray (EDX). Magnetization assessments were undertaken, exploring the magnetic effect of the samples concerning temperature and field variables. Notably, both samples exhibited a ferrimagnetic state at 300K, evident from their M–H curves. This comprehensive study illuminates the magnetic attributes of nano-sized Fe3O4 particles, providing valuable insights into their versatile behavior across varying conditions and augmenting the comprehension of their potential applications. [ABSTRACT FROM AUTHOR]

A polycrystalline ferrite sample of Co0.9Ni0.1Fe2O4 was successfully synthesized using the sol-gel auto-combustion process. The X-ray diffraction (XRD) analysis provided confirmation of the cubic phase spinel structure of the sample. To ensure the absence of any impurity phases, Rietveld refinement was conducted. The sample's crystallite size, existing in the nano regime, was determined using the Debye-Scherer formula. Field Emission Scanning Electron Microscopy (FESEM) demonstrated the prepared sample's spherical nature. Energy Dispersive Spectra (EDS) offered evidence of the elemental confirmation and purity of the synthesized nanoparticles. Additionally, the EDAX spectrum verified appropriate doping in the polycrystalline sample. Furthermore, the Fourier Transform Infrared Rays (FTIR) Spectrum, covering the range from 4000 cm−1 to 500cm−1, showcased a wide array of chemical interactions within the sample. The significance of this nano-crystalline Ni-doped CoFe2O4 ferrite lies in its biomedical applications, as it offers simplicity, cost-effectiveness, and reproducibility. [ABSTRACT FROM AUTHOR]

The objective of this study is to develop nanocrystalline CoFe2O4 for making them suitable for various applications such as sensors, recording devices, permanent magnets, solar cells, and magnetic drug delivery. The CoFe2O4 ferrite samples were prepared using the sol-gel method with varying amounts of citric acid. XRD characterization revealed a single-phase cubic structure, and the broad peak indicated the presence of nano-sized particles. The Debye-Scherrer formula was employed to calculate the crystallite size of the samples. Interestingly, increasing the citric acid content led to a decrease in the FWHM (full width at half maximum) broadening, as clearly observed in the XRD pattern. All samples were subjected to Field Emission Scanning Electron Microscopy (FE-SEM) to investigate the surface morphology, which revealed their well-produced spherical form. Additionally, Energy Dispersive Spectroscopy (EDS) confirmed the elemental composition of the samples, indicating appropriate doping in the polycrystalline samples. The presence of different chemical bonds was examined by Fourier Transform Infrared Rays (FTIR) Spectroscopy. [ABSTRACT FROM AUTHOR]