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Turtelli, R. S., Atif, M., Krippel, J., Grössinger, R., Kubel, F., & Linert, W. (2012). Superparamagnetic CoFe2O4 prepared by modified oxalate method. International Journal of Materials Research, 103(9), 1163–1165. https://doi.org/10.3139/146.110791
E138-03 - Forschungsbereich Functional and Magnetic Materials E163-01-2 - Forschungsgruppe Koordinationschemie und bio-anorganische Chemie E164-05-1 - Forschungsgruppe Experimentelle Strukturchemie
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Journal:
International Journal of Materials Research
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ISSN:
1862-5282
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Date (published):
2012
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Number of Pages:
3
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Publisher:
WALTER DE GRUYTER GMBH
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; Physical and Theoretical Chemistry; Materials Chemistry; Metals and Alloys; - Magnetic nanoparticles - Cobalt ferrite - Superparamagnetism - High anisotropy - Oxalate method
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Abstract:
The modified oxalate precursor method was used for the preparation of nanocrystalline CoFe2O4. Structural in"vestigations of as-produced powders performed by means of high-resolution transmission electron microscopy and X-ray diffraction revealed an average particle size of 8nm. The nanocrystallites are pure CoFe2O4and present a well crystallized spinel structure with lattice constant of 8.3583 Å....
The modified oxalate precursor method was used for the preparation of nanocrystalline CoFe2O4. Structural in"vestigations of as-produced powders performed by means of high-resolution transmission electron microscopy and X-ray diffraction revealed an average particle size of 8nm. The nanocrystallites are pure CoFe2O4and present a well crystallized spinel structure with lattice constant of 8.3583 Å. The particles are superparamagnetic exhibiting a blocking temperature around room temperature. The magnetization and the coercive field values obtained at 9T are 56.8emu∙g-1and 17.0 kOe (at 4.2K), respectively. The crystalline anisotropy determined from the coercive field as a function of temperature is 8.0×105J∙m-3, which is much higher than that of bulk materials.
