BaCe0.8−𝑥A𝑥Gd0.2O3−𝛿 (A = In, Zr, Ta; 𝑥 = 0, 0.1) ceramics were synthesized by solid-state reaction method. Microstructure and electrical properties of BaCe0.8−𝑥A𝑥Gd0.2O3−𝛿 ceramics were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and complex impedance analysis at intermediate temperatures of 573–1073 K in different atmospheres. BaCe0.8Gd0.2O3−𝛿, BaCe0.7In0.1Gd0.2O3−𝛿 and BaCe0.7Zr0.1Gd0.2O3−𝛿 ceramics exhibit a single cubic perovskite structure. BaCe0.7In0.1Gd0.2O3−𝛿 ceramic has the highest conductivity of 4.6 × 10-2 S.cm-1 in air at 1073 K. BaCe0.7In0.1Gd0.2O3−𝛿 and BaCe0.7Zr0.1Gd0.2O3−𝛿 ceramics exhibit an excellent chemical stability against boiling water. Indium is a suitable doping element to promote the sintering densification and to enhance both electrical conductivity and chemical stability of Gd-doped BaCeO3 at operating temperatures.
Volume 43, 2020
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