Banca de DEFESA: GUILHERME NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : GUILHERME NASCIMENTO
DATA : 05/04/2024
HORA: 10:00
LOCAL: Meet
TÍTULO:

Strontium hexaferrite (SrFe₁₂O₁₉), iron cobalt metal alloy (CoFe₂), Ionic Coordination Reaction (RCI), Co -precipitation, Sol-Gel.

PALAVRAS-CHAVES:

SrFe₁₂O₁₉, CoFe₂, RCI; Coprecipitation, Hexaferrite, Metal alloy.

PÁGINAS: 84
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
ESPECIALIDADE: Materiais Magnéticos e Propriedades Magnéticas
RESUMO:

Nanostructures have been studied for many years and consequently contributing to technological advancement and the development of society, they can be optimized with the right elements, by adjusting these materials we have nanostructures magnetic systems, with great potential in cancer therapy due to their ability to heat in alternating magnetic fields. Therefore, the work aims to obtain a composite of strontium hexaferrite (SrFe₁₂O₁₉) and the metallic alloy iron cobalt (CoFe₂), thus producing optimized nanoparticles with low cost of production. Obtaining it in its structural form that best maximizes its magnetic characteristics, namely saturation magnetization and coercivity, thus improving its maximum energy product. Firstly, the material CoFe2 was synthesized using the co-precipitation method, in the second stage, SrFe₁₂O₁₉ was produced also by Co-precipitation, Sol-Gel and Reaction by Ionic Coordination (RCI). Heat treatments were applied to the CoFe2 samples, carried out in a nitrogen atmosphere, in both cases the samples were subjected to a temperature of 750 ºC with a time between 30 and 120 minutes, as for the SrFe₁₂O₁₉ samples the temperature varied between 1000 and 1200 ºC for 6 hours. Subsequently, the materials were characterized, and the techniques used were X-rays (XRD), vibrating sample magnetometer (MAV-VSM), scanning electron microscopy (SEM). This resulted in obtaining pure phases of both composites, with an average grain size of 109.2 to 139.4 nm for CoFe2 and 128.5 to 451.3 textitnm for SrM, for M_S we had the highest of 171 emu/g and 50.2 emu/g for CoFe₂ and SrFe₁₂O₁₉,
respectively, with a maximum coercive field of 4.93 kOe for SrFe12O19, and 0.33 kOe for the metallic alloy. The death results are as expected.

MEMBROS DA BANCA:
Presidente - 050.025.724-80 - RODOLFO BEZERRA DA SILVA - UERN
Interno - 4260 - JOÃO MARIA SOARES
Externo à Instituição - TIBÉRIO MAGNO DE LIMA ALVES