Study of the Reproducibility of Ni-Zn Nanoferrite Obtained by Combustion Reaction

Abstract

This work involved a study of the reproducibility of the process of combustion synthesis to produce Ni-Zn ferrites. The structural, morphological and magnetic characteristics of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and magnetometry using an alternating gradient magnetometer (AGM). The XRD diffractograms of the samples indicated that they are monophasic, crystalline, with crystallite sizes ranging from 21 to 38 nm, and have a homogeneous morphology consisting of agglomerates of spherical particles. The samples behaved as soft magnetic materials, with magnetization levels ranging from 37 to 47 emug-1. The combustion synthesis was found to be efficient in producing Ni-Zn nanoferrites, yielding reproducible results.

From Disposal to Reuse: Production of Sustainable Fatty Acid Alkyl Esters Derived from Residual Oil Using a Biphasic Magnetic Catalyst

“…Due to the low values of remaining magnetization (6.0 my/g) and coercivity (0.06 (G)), it is possible to see that the ZnO-Ni 0.5 Zn 0.5 Fe 2 O 4 catalyst presents a soft magnetic behavior (i.e., easily magnetizes and demagnetizes. The hysteresis curve presents a well-defined S shape and a very narrow internal area, suggesting the catalyst studied has ferrimagnetic behavior [55]. The maximum saturation magnetization was 59.4 emu/g, higher than the values already reported in the literature [12].…”

Síntese e caracterização do ferroespinélio Ni0,7Zn0,3Fe2O4: avaliação de desempenho na esterificação metílica e etílica

“…Entre as várias técnicas de produção desses materiais, a síntese por reação de combustão mostra-se promissora por possibilitar a produção de nanomateriais em escala piloto com produção de 10 a 200 g/batelada [16][17][18][19][20]. Na área de catálise para biodiesel essa técnica tem sido viável para preparação de catalisadores, pois é rápida, reprodutível, possibilita a obtenção de nanomateriais sem etapas de calcinação intermediária e tem alcançado resultados de conversão em reações de esterificação e transesterificação promissores no aspecto científico e tecnológico.…”