W-H plot and electron spin resonance spectroscopy of magnetic CoFNPs induced up to 100 kGy Co60 γ-rays

• Published in: Radiation effects and defects in solids Vol. 177; no. 7-8; pp. 847 - 868
• Main Authors: Patil, Aruna G., Keche, Atul P., Rajmane, S. V., Raut, Anil V.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 03.08.2022; Taylor & Francis Ltd
• Subjects: Atomic force microscopy; Cobalt; Cobalt ferrites; Cobalt nanoparticles; Combustion synthesis; Continuous radiation; Crystallites; Electron paramagnetic resonance; Electron spin; electron spin resonance; gamma irradiation; Gamma rays; Histograms; Nanoparticles; Physical properties; Radiation damage; Resonance; Sol-gel processes; Spectroscopy; Spectrum analysis; Spin resonance; Topology; Williamson-Hall function; X-ray diffraction
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420150.2022.2089142

In this paper, we portray the simulation of continuous-wave electron spin resonance (ESR) of magnetic cobalt ferrite nanoparticles (CoFNPs) which were assembled using simple sol-gel auto-combustion synthesis and irradiated with gamma dose up to 100 kGy. An emphasis has been given for estimating the crystallite size by re-evaluating Debye-Scherrer's value with the Williamson-Hall extrapolation function (W-H plot) drawn from X-Ray Diffraction (XRD) data. Also, the lattice parameter was re-confirmed via plots. The SEM images have supported the nanosize of the CoFNPs and the skewed histogram chart has suggested the average grain distribution range 96.18-123.49 nm ± 10. The topology of the samples was studied by the atomic force microscopy images. In the first derivative peak of ESR spectroscopy, an isotropic value, i.e. gyroscopic spitting factor (Lande's g-value), and line width (ΔH pp ) were used to examine the γ-radiation damage in the investigated CoFNPs samples. The present analysis may help an individual to comprehend the innumerable intra-atomic and molecular constraints affecting the subsequent physical properties of ferrite nanoparticles.