Crystallite size induced crossover from paramagnetism to superparamagnetism in zinc ferrite nanoparticles
- Crystallite size induced crossover from paramagnetism to superparamagnetism in zinc ferrite nanoparticles
- Jitendra Pal Singh; Sanjeev Gautam; R.C. Srivastava; K. Asokan; D. Kanjilal; 채근화
- Nanoparticles; Magnetic materials; Spectroscopy
- Issue Date
- Superlattices and microstructures
- VOL 86, 390-394
- Present work investigates the crossover from paramagnetism to superparamagnetism as a
function of crystallite size in zinc ferrite nanoparticles using near edge X-ray absorption
spectroscopy. Synthesized paramagnetic and superparamagnetic nanoparticles exhibit
presence of Fe2+ and Fe3+ ions with dominant concentration of Fe3+ ions. Fe L- and O
K-edges spectra of paramagnetic nanoparticles consist of more intense spectral features
compared to that of superparamagnetic nanoparticles. This reflects enhanced t2g and eg
symmetry states of Fe–O hybridized states in paramagnetic nanoparticles induced by
increased degree of crystallization.
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