Banca de QUALIFICAÇÃO: TALES GOMES DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : TALES GOMES DA SILVA
DATA : 10/11/2017
HORA: 09:00
LOCAL: Sala de aula do Química 1
TÍTULO:

Synthesis and characterization of Calcium Zirconate (CaZrO₃)

PALAVRAS-CHAVES:

Perovskite, Combustion synthesis

PÁGINAS: 65
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Química do Estado Condensado
RESUMO:

Perovskite compounds, such as Calcium Zirconate, have the structural formula ABO₃ and form a class of materials with interesting optical, magnetic and electrical properties, which has several scientific and technological applications. Perovskite materials will be portrayed in this work, because they present physicochemical stability and interesting specific properties. Therefore, this work aims to analyze the synthesis of perovskites by the combustion method, performing the characterization of the samples by means of X-ray diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), Dispersive Energy Spectroscopy EDX or EDS) and X-ray Fluorescence. The evolution of the CaZrO3 crystallization process and the composition of the samples were accompanied by X-ray diffraction. The obtained X-ray patterns were refined with the Rietveld method. Scanning electron microscopes were used to identify the presence of defects and morphology of the samples. The characterization methods showed structural differences in the samples in function of the variation of the composition of the system. The results indicate a transition from deep defects to shallow defects due to the presence of secondary phases in the system.

MEMBROS DA BANCA:
Presidente - 350633 - ADEMIR OLIVEIRA DA SILVA
Externo à Instituição - JARLEY FAGNER SILVA DO NASCIMENTO - IFRN
Interno - 7350310 - MARIA DE FATIMA VITORIA DE MOURA