Banca de DEFESA: DANYELLE PRISCILA DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANYELLE PRISCILA DA SILVA
DATA : 14/02/2017
HORA: 15:00
LOCAL: AUDITÓRIO DO DFTE
TÍTULO:

Experimental Study of the Binary System Samário Ferro

PALAVRAS-CHAVES:

Iron samarium binary system, Intermettalics compounds, Intermediates phases, metastable phase.

PÁGINAS: 85
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

Intermetallic alloys composed of a rare earth element and a transition metal have attracted great scientific interest in the last decades. Such interest occurs because these types of materials possess magnetic properties that make them strong candidates for the production of permanent high performance magnets. There are a large number of compounds that can be formed from the combination of a rare earth element and a 3d transition metal. In this work was carried out an experimental study of one of these combinations, the samarium iron system. The samples used in this study were alloys prepared by arc melt, with the following concentrations: Sm30Fe70, Sm40Fe60, Sm50Fe50, Sm70Fe30 and Sm80Fe20. Subsequently, they were investigated by X-ray diffraction, metallography, thermomagnetic analysis and magnetometry. In these samples three intermediates were identified: Sm2Fe17, SmFe3 and SmFe2. The network parameters and Curie temperatures of these compounds were determined. The magnetic properties of the first three samples (Sm30Fe70, Sm40Fe60 and Sm50Fe50) were consistent with the ratio and magnetic characteristics of the intermetallic compounds present. However, for the last two samples (Sm70Fe30 and Sm80Fe20), the study indicated a possible formation of metastable phases. There was also a dependence of the magnetic properties on the samarium concentration.

MEMBROS DA BANCA:
Presidente - 350830 - JOSE HUMBERTO DE ARAUJO
Interno - 1675199 - SUZANA NOBREGA DE MEDEIROS
Externo à Instituição - JOÃO MARIA SOARES - UERN