Abstract
In the present work, we have synthesized and characterized magnetic nanoparticles of maghemite γ-Fe2O3 to study their structural and magnetic properties. For the preparation, magnetite precursor, were oxidized by adjusting the pH = 3.5 at about 80 ºC in an acid medium, The mean size of the maghemite particles calculated from the X-ray diffractogram was around 5.7 nm. Mössbauer spectroscopy measurements at room temperature show their superparamagnetic behavior. Furhermore, Mössbauer measurements were carried out at 77 K and 4.2 K in order to find the typical hyperfine fields of the maghemite. Magnetite phase was not found. FC and ZFC magnetization curves measured at 500 Oe indicate a blocking temperature of 105.3 K. The magnetization measurements also show almost zero coercivity at RT. TEM images show nanoparticles with diameter smaller than 10 nm, which are in good agreement with the X-ray pattern and the fitting of the magnetization data.
Proceedings of the 13th Latin American Conference on the Applications of the Mössbauer Effect, (LACAME 2012), Medellín, Colombia, 11–16 November 2012.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Kluchova, K., Zboril, R., Tucek, J.: Biomaterials 30, 2855–2863 (2009)
Nijdam, A.J., Nicholson, T.R., Shapiro, J.P.: Curr. Nanosci. 5, 88–102 (2009)
Goya, G.F., Grazú, V., Ibarra, M.R.: Curr. Nanosci. 4, 1–16 (2008)
Kang, Y.S., Banerjee, D., Risbud, S., Rabolt, J., Stroeve, P.: Chem. Mater. 8, 2209–2211 (1986)
Brand, R.A.: Normos Programs. Duisburg University (1989)
Klug, H.P., Alexander, L.E.: X-ray Diffraction Procedures, p. 514. Wiley, New York (1970)
Vandenberghe, R.E., De Grave, E.: In: Yoshida, Y., Langouche, G. (eds.) Mössbauer Spectroscopy – Tutorial Book, chap. 3. Springer-Verlag, Berlin Heidelberg (2013)
Gütlich, P., et al. (eds.): Mössbauer Spectroscopy and Transitions Metal Chemistry: Fundamentals and Applications. Springer (2011)
Morup, S.: Proceedings of the Indian National Science Academy, pp. 91–107. ICAME (1981)
Morup, S., Oxborrow, C.A., Hendriksen, P.V., Pedersen, M.S., Hanson, M., Johanson, C.: J. Magn. Magn. Mater. 140, 409–410 (1995)
Disch, S., et al.: New J. Phys. 14, 013025, supplementary information (2012)
Pascal, C., et al.: Chem. Mater. 11, 141–147 (1999)
Coaquira, J.A.H., et al.: IEEE Trans. Magn. 45, 10 (2009)
Georgia, C., Papaefthymiou, et al.: Phys. Rev. B 80, 024406 (2009)
Chen, D.-X., et al.: J. Appl. Phys. 105, 083924 (2009)
Hyeon, T., Lee, S.S., Park, J., Chung, Y., Bin Na, H.J.: Am. Chem. Soc. 123, 12798–12801 (2001)
Rebbouh, L., Hermann, R.P., Grandjean, F.: Phys. Rev. B 76, 174422 (2007)
Hanesch, M.: Geophys. J. Int. 177, 941–948 (2009)
De Faria, D.L.A., Silva, V., et al.: J. Raman Spectrosc. 28, 873–878 (1997)
Mazzeti, L., Thislethwaite,: J. Raman Spectrosc. 33, 104–111 (2002)
Wei, L., Hervé, M., Edouard, P.: J. Cryst. Growth 342, 21–27 (2012)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer Science+Business Media Dordrecht
About this paper
Cite this paper
Guivar, J.A.R. et al. (2013). Mössbauer study of intermediate superparamagnetic relaxation of maghemite (γ-Fe2O3) nanoparticles. In: Meneses, C.A.B., Caetano, E.P., Torres, C.E.R., Pizarro, C., Alfonso, L.E.Z. (eds) LACAME 2012. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6482-8_11
Download citation
DOI: https://doi.org/10.1007/978-94-007-6482-8_11
Published:
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-6481-1
Online ISBN: 978-94-007-6482-8
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)