Abstract
We have characterized a system of maghemite, γ-Fe2O3, nanosized particles prepared by a microemulsion method using an ionic surfactant. The Mössbauer spectra from 21 to 298 K evolve from a totally magnetically split signal at low temperatures to a single superparamagnetic (sp) doublet at 298 K with a blocking temperature of ≈150 K. The real component of the AC susceptibility (5≤ν≤104 Hz) displays a behavior characteristic of a system of interacting particles. A broad distribution of the particle sizes is revealed by the much higher average energy barrier obtained by AC susceptibility than Mössbauer.
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Tueros, M.J., Baum, L.A., Borzi, R.A. et al. Characterization of Nanosized Maghemite Particles Prepared by Microemulsion Using an Ionic Surfactant. Hyperfine Interactions 148, 103–108 (2003). https://doi.org/10.1023/B:HYPE.0000003770.22742.e7
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DOI: https://doi.org/10.1023/B:HYPE.0000003770.22742.e7