Banca de DEFESA: RAIMUNDO NAZARENO DA SILVA CONCEIÇÃO FILHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RAIMUNDO NAZARENO DA SILVA CONCEIÇÃO FILHO
DATA : 01/09/2017
HORA: 10:00
LOCAL: Auditório do DFTE
TÍTULO:

Synthesis and Characterization of Magnetic Nanoparticles of the Cobalt Samarium System

PALAVRAS-CHAVES:

Polyol method, samarium cobalt system, magnetic nanoparticles, acetic acid.

PÁGINAS: 50
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

In this work we used the chemical polyol method for the preparation of Sm-Co nanoparticles. The synthesized samples were named in the following forms: ARS-0%; ARS-5%, ARS-7% and ARS-9%, being the percentages referring to the variation of Acetic Acid used in the synthesis. The structural characterization was performed by     X-ray diffraction and transmission electron microscopy (TEM). The structural parameters were determined by the Rietvelt method using the Maud software. The following phases were identified: SmCo7; Sm2CO7; Sm2Co17 and Sm5Co19. For the study of magnetic properties, measurements with the vibrating sample magnetometer were used to obtain magnetization curves as a function of the magnetic field applied at room temperature. The PPMS was used to measure magnetization curves as a function of temperature. The Curie temperatures obtained are in accordance with the phases obtained by the structural characterization methods. Images of the samples were obtained through the SEM and MET for morphological study and determination of the size of the nanoparticles of the samples. Our results show the feasibility of the polyol method to obtain Sm-Co nanoparticles and the influence of Acetic Acid in the synthesis process.

MEMBROS DA BANCA:
Interno - 6345702 - ARTUR DA SILVA CARRICO
Externo à Instituição - GUSTAVO DE OLIVEIRA GURGEL REBOUCAS - UFERSA
Presidente - 350830 - JOSE HUMBERTO DE ARAUJO
Interno - 1674707 - MARCO ANTONIO MORALES TORRES