DOI: 10.1557/jmr.2002.0083. Iron and Iron-oxide on Silica Nanocomposites Prepared by the Sol-gel Method

Iron and Iron-oxide on Silica Nanocomposites Prepared by the Sol-gel Method

10.1557/jmr.2002.0083

Crossref journal-article

Springer Science and Business Media LLC

Journal of Materials Research (297)

Abstract

γ–Fe2O3/SiO2 and Fe/SiO2 nanocomposites, with a Fe/Si molar ratio of 0.25, were prepared by the sol-gel method starting from ethanolic solutions of tetraethoxysilane and iron (III) nitrate. After gelation the xerogels were oxidated or reduced. Samples were investigated by transmission electron microscopy, x-ray diffraction, differential scanning calorimetry, and thermogravimetry. Magnetic properties of the samples were investigated at room temperature (RT) and at 77 K. Nanometric particles supported in the silica matrix were obtained in all cases. Bigger particles (10 nm) were obtained in the case of Fe/SiO2 nanocomposites with respect to the γ–Fe2O3/SiO2 samples (5–8 nm). A slight effect of sol dilution on particle size was observed only in the case of γ–Fe2O3/SiO2 nanocomposites. A superparamagnetic behavior was shown at RT only by γ–Fe2O3/SiO2 nanocomposites. Iron-based composites exhibited coercivity values higher than 700 Oe at RT.

Bibliography

Ennas, G., Casula, M. F., Piccaluga, G., Solinas, S., Morales, M. P., & Serna, C. J. (2002). Iron and Iron-oxide on Silica Nanocomposites Prepared by the Sol-gel Method. Journal of Materials Research, 17(3), 590â596.

Authors 6

G. Ennas (first)
M. F. Casula (additional)
G. Piccaluga (additional)
S. Solinas (additional)
M. P. Morales (additional)
C. J. Serna (additional)

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Dates

Type	When
Created	17 years, 5 months ago (March 5, 2008, 9:41 p.m.)
Deposited	4 years, 6 months ago (Feb. 24, 2021, 3:09 p.m.)
Indexed	1 year, 1 month ago (July 18, 2024, 5:55 p.m.)
Issued	23 years, 5 months ago (March 1, 2002)
Published	23 years, 5 months ago (March 1, 2002)
Published Online	14 years, 7 months ago (Jan. 31, 2011)
Published Print	23 years, 5 months ago (March 1, 2002)

Funders 0

None

BibTeX

@article{Ennas_2002, title={Iron and Iron-oxide on Silica Nanocomposites Prepared by the Sol-gel Method}, volume={17}, ISSN={2044-5326}, url={http://dx.doi.org/10.1557/jmr.2002.0083}, DOI={10.1557/jmr.2002.0083}, number={3}, journal={Journal of Materials Research}, publisher={Springer Science and Business Media LLC}, author={Ennas, G. and Casula, M. F. and Piccaluga, G. and Solinas, S. and Morales, M. P. and Serna, C. J.}, year={2002}, month=mar, pages={590–596} }

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