Iêdo Alves de Souza

Doutor - Ex-Aluno de Doutorado - Pesquisador
Iêdo	Graduado(a) em: Engenharia Civil Último(a) Orientador(a) no INCTMN/CMDMC: Elson Longo   Laboratório: Liec UNESP     Início no INCTMN/CMDMC: 2002          Término no INCTMN/CMDMC :       2006
Resumo de Trabalho:
Ceramic materials based on strontium and barium titanate (BST) pure or doped with Sn (BST:Sn), posses ferroelectric and optical properties which important technological applications. Those properties are affected by sthoichiometry of material, synthesis and processing route and dopants. In our case the ferroelectric and optical properties and microstructure of system Ba0,5Sr0,5(Ti1−xSnx)O3 were investigated, considering various molar percentages (mol %) for powders and films synthesized by polymeric precursor method (MPP). In this method it was utilized, as a main source of cations, barium carbonate, strontium carbonate and titanium isopropoxide. For reaction of complexation was used cytric acid and for polymerization was used ethylene glycol. After preparation, the powders and films with disordered and crystalline structure, were characterized using various technique as are X-ray diffraction (XRD), thermogravimetric analysis (TG) and differential thermo-analysis (DTA), ultraviolet-visible spectroscopy (UV-vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman and infrared spectroscopy (IR) with Fourier transformation to investigate metal–oxygen (M-O) formation in the material. Emission specters of the Ba0,5Sr0,5 (Ti1−xSnx)O3 (x=0.00; 0.05; 0.10 e 0.20) system at room temperature were obtained and analized.

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