Síntese, caracterização e estudo das propriedades magnéticas do Zn(1-x)EuxO (0,0 ≤ x ≤ 0,035) produzido por reação de combustão

• Ano de defesa: 2013
• Autor(a) principal: Soares, Mônica Pereira
• Orientador(a): Franco Júnior, Adolfo
• Banca de defesa: Franco Júnior, Adolfo, Silva, Ladir Cândido da, Ruggiero, Marçal Antônio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Química (IQ)
• Departamento: Instituto de Química - IQ (RG)
• País: Brasil
• Palavras-chave em Português: Zinco; Propriedades magnéticas; Nanocristálitos de óxido; Reação de combustão
• Palavras-chave em Inglês: Zinc; Magnetic properties; Nanocrystallites of zinc oxide; The combustion reaction
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/3727

Nanocrystallitics of Zinc Oxide containing different amounts of Europium (Zn(1-X)EuxO – it being 0,0 ≤ x ≤ 0,035) were synthesized by a combustion reaction, with the aim of evaluating the effect of the concentration of Eu3+ in magnetic properties, after obtained. The chemical composition was determined by energy dispersive spectroscopy, X-ray (EDS). The structural characterization was performed by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetrics Analysis (TGA), Spectroscopy Photoelectrons Excited by X-Rays (XPS) and Transmission Electron Microscopy (TEM). Crystallinestructure powders of ZnO in wurtzita were formed after the thermical treatment at 550°C about one hour, with average size crystallites of 20 nm. The X-Ray Diffraction results showed presence of diffraction peaks of well-defined of ZnO primary characteristic phase and traces of oxide Europium (Eu2O3) as secondary stage for samples doped with 3.5% of Eu3+. The analyzes showed the magnetic samples exhibit ferromagnetism at room temperature dependent content of ions Eu3+, but for the sample doped with 3.5% Europium the magnetization drops considerably, due to the formation of Oxide Europium (Eu2O3) non-magnetic. This fact suggests that the ferromagnetism of samples is associated with the Eu3+ ions, it is occupying the interstices of matrix semiconductor wafer.