NANOSTRUCTURED FERRITE AFe2O4 (A= Mg, Cu, Zn) PREPARED BY AUTO-COMBUSTION METHOD

A. F. CABRERA; C.E RODRÍGUEZ TORRES; S.J. STEWART

Congreso; LACAME; 2018

NANOSTRUCTERED FERRITES MFe2O4 (M=Mg, Cu, Zn) PREPARED BY AUTOCOMBUSTION METHODCabrera, A.F1*; Rodríguez Torres, C1; Stewart, S3 1Instituto de Física La Plata, CONICET, Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata* Corresponding Author: cabrera@fisica.unlp.edu.ar; CC67, 1900, La Plata, Argentina KEYWORDS: spinel ferrites, magnetic materials, nanostructuresTopic Conference (Choose one that better fits to your work) for instance:T08: Magnetism and Magnetic MaterialsThe Nanostructured spinel ferrites MFe2O4 (M = Mg, Cu, Zn) present interesting magnetic and electrical properties, which make them good candidates to be used in many areas such as catalysis, nanoelectronics, biomedicine and as nanosensors (1). The large surface-volume ratio and the size effects are recognized to be the origin of most of the novel magnetic properties displayed by nanostructuring a magnetic materials. However, for spinel compounds these are not only responsible for such properties but they are highly dependent on the method of synthesis (2). The present work investigates the physical properties of nanostructured MgFe2O4, CuFe2O4 and ZnFe2O4 prepared by the autocombustion method (3). The samples were characterized by Mössbauer spectroscopy, thermogravimetric analysis, differential scanning analysis, x-ray diffraction, ultraviolet-visible reflectance and magnetic measurements. The structural and and Mössbauer results show that independently of the synthesis conditions only the ferrite spinel phase is present. The magnetic measurements show a hysteretic behavior that does not reach saturation even for the largest applied magnetic field. This is indicative of the presence of a ferromagnetic component plus a superparamagnetic and/or due to spin canting signal that can be associated with the nanometric character of the material. The energy gap obtained from UV-Vis measurements and the magnetic behavior will be discussed in terms of the different cation occupancy of tetrahedral and octahedral spinel sites References1)H. Arabi, N. Moghadam, J. Magn. Magn. Mater. 335 (2013) 144-1482) A. Hajalilou, S. Mazlan, Appl. Phys. A 122 (2016) 680:1-153)M. Murugesan, M. Perumal, G. Chardrasekaran, Phys. B 448 (2014) 53-56