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Ceramica  2011 

Efeito da adi??o de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

DOI: 10.1590/S0366-69132011000200018

Keywords: barium zirconate, boron oxide, zinc oxide, impedance spectroscopy, protonic conductor.

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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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