NDLI: Enhanced magnetic coercivity of α-Fe$_{2}$O$_{3}$ obtained from carbonated 2-line ferrihydrite

Content Provider	Springer Nature Link
Author	Vallina, B. Rodriguez Blanco, J. D. Brown, A. P. Benning, L. G. Blanco, J. A.
Copyright Year	2014
Abstract	We report the physical properties of α-Fe$_{2}$O$_{3}$ (hematite), synthesized by dry-heating (350–1,000 °C) of a new, poorly ordered iron oxyhydroxide precursor compound that we name carbonated 2-line ferrihydrite. This precursor was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, electron microscopy, and thermogravimetric analysis, whereas the α-Fe$_{2}$O$_{3}$ was studied with X-ray diffraction, scanning and transmission electron microscopy, and magnetic techniques. α-Fe$_{2}$O$_{3}$ synthesized at 350 °C consisted of single-nanocrystal particles (length × width 20 ± 6 nm (L) × 15 ± 4 nm (W)), which at room temperature exhibited very narrow hysteresis loops of low coercivities (<300 Oe). However, α-Fe$_{2}$O$_{3}$ synthesized at higher temperatures (1,000 °C) was composed of larger nanocrystalline particle aggregates (352 ± 109 nm (L) × 277 ± 103 nm (W)) that also showed wide-open hysteresis loops of high magnetic coercivities (~5 kOe). We suggest that these synthesis-temperature-dependent coercivity values are a consequence of the subparticle structure induced by the different particle and crystallite size growth rates at increasing annealing temperature.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	16
Issue Number	3
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-02-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hematite Ferrihydrite High coercivity Carbonate Microstructure Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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