DINIZ, V. C. S.; http://lattes.cnpq.br/9239037374332331; DINIZ, Verônica Cristhina de Souza.
Résumé:
The study of the processing of Ni-Zn ferrite is of utmost importance for improving their
magnetic properties, since they are directly influenced by the final microstructure of the
material and get a ferrite with a uniform microstructure is a major challenge in the
advancement of new technologies. This study aims to evaluate the influence of
temperature and exposure time on stage sintering of Ni-Zn ferrite by microwave energy,
and their subsequent structural characterization, microstructural, physical and magnetic
order to obtain materials with soft magnetic behavior. The samples of Ni-Zn ferrite were
sintered using microwave energy at temperatures of 900°C, 1000°C, 1100°C and
1200°C and exposure time of 10, 20 and 30 minutes, respectively. Then were
characterized by density measurements, X-ray diffraction (XRD), fluorescence
spectroscopy X-ray energy dispersive (EDX), scanning electron microscopy (SEM) and
magnetic measurements. Through the analysis results showed that the effect of varying
the exposure time was the predominant sintering temperature variation in the measured
density values, a maximum density value of 96% for the sintered sample at higher
temperature and longer exposure time. All samples obtained from the training phase
Nid^/.no^Fc/)^ with all peaks with high intensity and high basal width for all sintering
conditions. The variation of both the time and the sintering temperature is not
significantly modify the chemical composition of the sintered ferrite, in general
experimental values were close to theoretical values calculated. It was possible to obtain
a nanostructure with behavior characteristic of a soft magnetic material, with maximum
saturation magnetization of 71 emu / g for the sample sintered at higher temperature and
longer time of exposure.
