Ferromagnetic resonance of precipitated phases in natural glasses
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2021, Journal of Molecular StructureCitation Excerpt :This leads implicitly to a diminished number of resonant centers delivering the Fe3+ EPR spectrum recorded after immersion in SBF than that before immersion, and clarifies the suspicion of iron release from shell. The peak-to-peak width of g ≈ 2.0 resonance line is 290 G. Narrow resonance lines at g ≈ 2, usually close to or narrower than the 200 G, are considered typical to a superparamagnetic phase like hematite (α-Fe2O3) while large and asymmetrical lines at g ≈ 2 are associated with magnetite (Fe3O4) or maghemite (γ-Fe2O3) particles [63]. Nevertheless, the presence of superparamagnetic hematite confers a reddish color to the sample, while the presence of superparamagnetic magnetite confers a grey color.
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2019, Geochimica et Cosmochimica ActaCitation Excerpt :On the other hand, the Fe3+/Fetotal and NiO content of spinels from K-T spherules (pink area in Fig. 10A) correspond to a present day, oxygen-rich, atmosphere (Toppani and Libourel, 2003), and exclude EPR signals with g = 3. Finally, it is important to note that the EPR line at |g| = 3 is sufficiently narrow to be detectable in horizon F, which indicates that the corresponding spinel are superparamagnetic, implying that the size of these particles is at most a few tens of nm (Griscom, 1984). For larger particles, the EPR signal would be broadened and distorted (ferromagnetic resonance), which would strongly limit their detection at low concentrations (Griscom, 1984).
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