Banca de QUALIFICAÇÃO: JOSE GLEISON OLIVEIRA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JOSE GLEISON OLIVEIRA SILVA
DATA : 27/09/2023
HORA: 08:00
LOCAL: UERN - CAMPUS CENTRAL
TÍTULO:

Magnetic silicoaluminous glasses doped with manganese and iron: synthesis and study of their physical properties

PALAVRAS-CHAVES:

Mineral residue; Minerals; Casting process; Magnetic silico-aluminous glasses; Magnetic behavior

PÁGINAS: 37
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
ESPECIALIDADE: Materiais Magnéticos e Propriedades Magnéticas
RESUMO:

The search for alternatives for the reuse of rejects and residues produced by industrial activities is a challenge faced strongly by modern society. These transformation proposals are intended to direct these rejects and residues to another purpose, in addition to reducing possible negative effects and promoting sustainability. Mining activities in Brazil and around the world face this challenge. In the case of scheelite waste, its composition is extremely close to the precursors used to manufacture glass. In this way, it will be proposed to use scheelite waste for the synthesis of silico-aluminous glasses at high temperatures, as well as to evaluate possible changes in the properties of these glasses due to magnetic separation in the waste and the incorporation of manganese. Initially, four samples were prepared: Glass-Mn1%, Glass-Mn3%, Glass-Mn5% and Glass-Mn10%. All samples were prepared in a graphite crucible at a temperature of 1400oC for 30 minutes. Subsequently, the samples are removed from the oven and poured onto a plate. After the casting stage, all samples went through the finishing stage in order to obtain a smooth and transparent surface. The results of X-ray diffractometry (XRD) guaranteed the formation of the amorphous phase. X-ray Fluorescence Spectroscopy (EFRX) confirmed the incorporation of manganese into the glass matrix. Magnetic properties were studied through magnetization curves at 10K and 300K using a Vibrating Sample Magnetometer (MAV) revealing paramagnetic and ferromagnetic behaviors.

MEMBROS DA BANCA:
Externo à Instituição - EDUARDO PADRÓN HERNÁNDEZ - UFPE
Externo à Instituição - KEURISON FIGUEREDO MAGALHÃES - UERN
Externo à Instituição - FELIPE BOHN - UFRN