efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio effect of zinc oxide and boron oxide addition on the properties of yttrium-doped barium zirconate

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ID: 194609
2011
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Abstract
Compostos condutores protônicos de BaZr0,8Y0,2O3-δ, preparados por síntese de estado sólido, foram compactados e sinterizados com ZnO e B2O3 como aditivos. Os corpos cerâmicos sinterizados foram analisados por difração de raios X e espectroscopia de impedância. Superfícies polidas e atacadas termicamente foram observadas em microscópio de varredura por sonda. As medidas de densidade mostraram que a maior densificação foi obtida com óxido de zinco nas proporções de 2 e 5 peso%, atingindo aproximadamente 95% da densidade teórica. As medidas de resistividade elétrica evidenciaram a menor resistividade elétrica do composto cerâmico BaZr0,8Y0,2O3-δ com 5 peso% de ZnO. Os aditivos de sinterização, óxido de boro e óxido de zinco, foram eficientes para obter compostos com menores valores de resistividade elétrica que os obtidos em compostos sinterizados sem aditivos.
BaZr0.8Y0.2O3-δprotonic conductors, prepared by the ceramic route, were pressed and sintered with ZnO and B2O3 sintering aids. The sintered pellets were analyzed by X-ray diffraction and impedance spectroscopy. Polished and thermally etched surfaces of the pellets were observed in a scanning probe microscope. The highest values of apparent density, 95%T.D., were obtained with 2 and 5 wt.% ZnO. The lowest value of electrical resistivity was evaluated in the yttrium-doped barium zirconate compounds with 5 wt.% ZnO. Boron oxide and zinc oxide sintering aids were efficient to improve the apparent density as well as the electrical conductivity of BaZr0.8Y0.2O3-δprotonic conductors.
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andrade2011cermicaefeito Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;T. F. Andrade;R. Muccillo
Journal Zootaxa
Year 2011
DOI
10.1590/S0366-69132011000200018
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132011000200018
Keywords
zinc oxide impedance spectroscopy boron oxide civil engineering (general)

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