Propriedades elétricas e estruturais de materiais cerâmicos à base de AZrO3-Bi(Zn1/2Ti1/2)O3, (A=Ca, Ba, Sr)

• Ano de defesa: 2020
• Autor(a) principal: Monteiro, Daniela Aparecida
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Física (IF); UFMT CUC - Cuiabá; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Estado sólido; Zirconatos; Perovskita; Impedância; Raios-X; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA; Solid state; Zirconates; Perovskite; Impedance; X ray
• Link de acesso: http://ri.ufmt.br/handle/1/3552

Materials containing Bi are an alternative to perovskits lead free, as in the case of titanium zinc bismuth Bi(Zn1/2Ti1/2)O3. Such materials are used in piezoelectric applications. Besides that, these matrices are promising for applications in wireless technology. A small molar ratio of Bi(Zn1/2Ti1/2)O3 on the basis of AZrO3, (A = Ca, Ba, Sr) is able to conferring properties of interest in the matrix. In this work, ceramic matrices based AZrO3: Bi(Zn1/2Ti1/2)O3, (A = Ca, Ba, Sr) (A = Ca, Ba, Sr) were prepared by the solid state reaction method to investigate their structural and electrical properties. The material was subjected at mechanical alloying, which initiated a synthesis reaction of the material. After that milling time, the material was calcined at 1000 °C/5 hours in order to determination of the crystalline phase. Therefore, sintering at 1200 °C/5 hours. X-ray diffraction measurements were carried out after calcination and sintering. We conclude that X-ray diffraction measurements for the matrices CZ:BZT, SZ:BZT e BZ:BZT molar ratio differente were consistent whit ICSD code 37264, 173398 and 27048, respectively to zirconates. It was also possible to determine a densification for all matrices investigated in this work. The value of the density was obtained in approximately 4 to 5.5 g/cm3 , as well as achieved dense ceramic particles for the electrical investigation. Impedance spectroscopy measurements indicate that BZT has influence on matrix electrical resistance. As scanning electron microscope measurements shown that according the BZT molar ratio increses, the grain size decreases for all matrices investigate in this work.