Abstract
Bismuth oxide (Bi2O3)-doped yttria-stabilized zirconia (YSZ) were prepared via the solid state reaction method. X-ray diffraction and electron diffraction spectroscopy results indicate that doping with 2 mol% Bi2O3 and adding 10 mol% yttria result in a stable zirconia cubic phase. Adding Bi2O3 as a dopant increases the density of zirconia to above 96%, while reducing its normal sintering temperature by approximately 250 °C. Moreover, electrical impedance analyses show that adding Bi2O3 enhances the conductivity of zirconia, improving its capability as a solid electrolyte for intermediate or even lower temperatures.
Highlights
Because of its good high-temperature electrical conductivity, thermal stability, and chemical stability, 8 mol% yttria-stabilized zirconia (8YSZ) ceramic material has been used as an oxygen ion conductor in oxygen sensors [1,2,3,4] and solid oxide fuel cells [5,6,7]
This study investigates the influence of Bi2 O3 on the polymorphic phasing and ionic conductivity of YSZ via X-ray diffraction (XRD), electron diffraction, electron microscopy, dielectric spectroscopy, etc
The 8YSZ sample was in complete cubic phase at the sintering temperature of 1550 ̋ C, while the 8YSZ doped with 2 mol% Bi2 O3 failed to produce a zirconia sample with a complete cubic phase
Summary
Because of its good high-temperature electrical conductivity, thermal stability, and chemical stability, 8 mol% yttria-stabilized zirconia (8YSZ) ceramic material has been used as an oxygen ion conductor in oxygen sensors [1,2,3,4] and solid oxide fuel cells [5,6,7]. Hirano et al [15] reported that doping with 1 mol% Bi2 O3 decreases the sintering temperature of scandia-stabilized zirconia ceramics by 300 ̋ C, while allowing its electrical conductivity at 1000 ̋ C and 800 ̋ C to reach 0.33 and 0.12 S/cm, respectively. Bai et al [16] studied the effect of Bi2 O3 on the physical and electrochemical properties of scandia-stabilized zirconia, and they found that the conductivity of samples doped with 2 mol% Bi2 O3 was enhanced. Some researchers [20,21] have studied the importance of cation disorder upon aliovalent doping and its effects on the enhancement of ion positional disorder in oxides with fluorite structures like YSZ. We report the effects of bismuth oxide doping on reducing zirconia sintering temperature, increasing the density and conductivity
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