Estudo das propriedades dielétricas e ópticas na matriz cerâmica CaBi4Ti4O15 com adição de V2O5, Er2O3 e Yb2O3

• Ano de defesa: 2015
• Autor(a) principal: Campos Filho, Mucio Costa
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ressoadores dielétricos; Temperatura de freqüência ressonante; Dielétricos; Resonant frequency temperature
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/13770

A strong demand for compressed materials, low cost and easy to manufacture are needed for various technological applications, in this sense many ceramics are candidates for its dielectric and optical properties .In this work, structural, dielectric and optical phase of the orthorhombic ferroelectric ceramic matrixCaBi4Ti4O15were investigated, one pseudo-perovskite bismuth layer structure (BLSFs) of space group A21am of the aurivillius family, prepared by the solid state method and sintered in low temperatures. Sample preparation for structural analysis and dielectric, had the addition of vanadium pentóxido (V2O5) to the phase CaBi4Ti4O15 calcined in ratios of 0.5, 1.0, 1.5, 2.0 and 5.0% by mass. To obtain optical properties of the ceramic matrix doped with rare earth ions erbiumIII (Er2O3) and III ytterbium oxide (Yb2O3). The study of the structure and composition of the samples was done by X-ray diffraction and confirmation was made by single stage rietveld refinement. The vibrational characteristics was obtained by Raman spectroscopy (RS). The morphology study off or analysis of grain and grain boundary, was performed by scanning electron microscopy. The dielectric characterization of radio frequency spectroscopy was performed in impedance which occurred two conductivity mechanisms for all samples, one at low frequency and the on the rat high frequency. Models of dielectric relaxation approach the Cole-Cole type model. Measures in the microwave range were obtained using the hakki-coleman method and monopole, which gave a temperature coefficient of resonant frequency (f) close to zero with the addition of V2O5. The dielectric permittivity measurements in radiofrequency and microwave, performe dat room temperature, had a high constant value (εr≈150) with the addition of 1%V2O5, and a value of relatively low loss tangent for family aurivillus (tan[δ]≈10-2) at 2 GHz. A numerical simulation was performed with each sample verifying approach with the experimental data. In rare earth doped samples was checked energy up-conversion phenomenon with the presence of intense bands samples of visible light emission in the green region and a less intense bands in thered region.The investigated material has potential for application in volatile memories, capacitive filters and optical components such as sensors, solar cells and LEDs.