Abstract
In this study, we investigate the effect of Ca2+ substitution on the structural and magnetic characteristics of ferrous ferric oxide CaxFe3-xO4 (x = 0.2 and 0.4) nanoparticles produced by the sol–gel auto combustion method with citric acid as a fuel agent. X-Ray Diffraction (XRD) results show that the average crystallite size is in the range of 20–22 nm and lattice parameter decreases with increasing calcium concentration. Field Emission Scanning Electron Microscope (FESEM) image shows the crystalline nature of calcium-substituted ferrous ferric oxide nanoparticles. Electron Diffraction Spectra (EDS) confirms the presence of Fe, Ca, and O atoms in prepared sample. Vibrating Sample Magnetometer (VSM) measures the magnetic field at room temperature which confirm the existence of a superparamagnetic behavior of Ca2+ substituted ferrous ferric oxide nanoparticles which plays an essential role in nanoscale devices such as MRI, MRAM, spin valve, MTJ, and bio-sensing devices applications.
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