Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) Nanocrystalline Powder - Advances in Nanoparticles

ANP > Vol.3 No.3, August 2014

Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe₂O₃) Nanocrystalline Powder ()

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DOI: 10.4236/anp.2014.33016 6,021 Downloads 8,710 Views Citations

Author(s)

Juan Adrián Ramos Guivar, Arturo Isaías Martínez, Ana Osorio Anaya, Luis De Los Santos Valladares, Lizbet León Félix, Angel Bustamante Dominguez

Affiliation(s)

Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK.
Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Cinvestav, Unidad Saltillo, Ciudad de México, México Ciudad de México, México.
Laboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Lima, Perú.
Laboratorio de Nanotecnología e Innovación Tecnológica, Departamento de Química e Ingeniería Química, Universidad Nacional Mayor de San Marcos, Lima, Perú.
Núcleo de Física Aplicada, Instituto de Física, Universidade de Brasília, Brasília, Brasil.

ABSTRACT

Structural and magnetic studies of monophasic maghemite (γ-Fe₂O₃) magnetic nanocrystallites (MNCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe₃O₄) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80°C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe₂O₃ MNCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe₂O₃ MNCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.

KEYWORDS

Monophasic Nanomaghemite, Rietveld Refinement, TEM, SAED, M-H Loops, ZFC

Share and Cite:

Guivar, J. , Martínez, A. , Anaya, A. , Valladares, L. , Félix, L. and Dominguez, A. (2014) Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe₂O₃) Nanocrystalline Powder. Advances in Nanoparticles, 3, 114-121. doi: 10.4236/anp.2014.33016.

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