Nanostructured Ferrites MFe2O4 (M=Mg, Cu, Zn) Prepared by Autocombustion Method, A. F. Cabrera, C. Rodríguez Torres and S. Stewart,

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

Conferencia; XVI Latin American Conference on the Applications of the Mössbauer Effect (LACAME); 2018

Spinel ferrites AFe2O4 (A = Mg, Cu, Zn) are very important magnetic materials due to their interesting magnetic and electrical properties. Another hand, nanostructures of magnetic materials have received increasing attention due to their new material properties that are significantly different from those of their bulk counterparts (1). The large surface-volume ratio is an attractive feature that can be achieved from the nanostructuring of magnetic materials. But not always the nanostructuring leads to the obtaining of properties that are only dependent on the size but also are highly dependent on the method of synthesis (2). Spinel nanostructures makes them potential candidates for use in many areas, for example nanocatalysis, nanosensors, nanoelectronics and nanomedicine (3). The present work investigated the fabrication of nanostructured MgFe2O4, CuFe2O4 and ZnFe2O4 by a variation of the autocombustion method (4). DRX and Mössbauer results shows the formation of the ferrite spinel without evidence of other phases. 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 signal that can be associated with the nanometric character of the material. The energy gap obtained from the UV-Vis measurements and the magnetic behavior depend on the type of cation A in the spinel structure.