Abstract
The following barium cerate zirconate compounds were prepared by the solid state route: BaZr0.1Ce0.7Y0.2O3-δ, BaZr0.1Ce0.7Dy0.2O3-δ, BaZr0.1Ce0.7Y0.1Dy0.1O3-δ, The powders were attrition milled, pressed and sintered at 1550 °/4 h. X-ray diffraction data of all compositions show the perovskite orthorhombic phase (powders) and the perovskite cubic phase (pellets). Impedance spectroscopy measurements in the 5 Hz-13 MHz frequency range show that Dy may substitute total or partially for Y without noticeable change in the electrical conductivity, whereas the Yb substitution leads to a decrease in the electrical conductivity. The bulk electrical resistivity follows the trend: Yb- < Dy- < Dy-Y- < Yb-Y- < Y-doped barium cerate zirconate sintered ceramics. A detailed scanning probe microscopy analysis of the polished and thermally etched surfaces of the sintered pellets show images of sub-intergranular regions, which are further evidences of the large grain boundary electrical resistivity of barium cerate compounds.
Published Version
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