Synthesis, Electrical Properties and Chemical Stability of BaCe_0.7In_0.3-xGd_xO_3-δ

Abstract:

In³⁺, Gd³⁺ were selected as substitution elements for Ce⁴⁺ in order to increase electrical conductivity and chemical stability of BaCeO₃. A modified sol-gel method was used to fabricate BaCe_0.7In_0.3-xGd_xO_3-δ (x = 0, 0.1, 0.2, 0.3) nanopowders. XRD results indicated that the diffraction angle moved to lower with increase of the Gd^{3 +} doping concentration, so that the interplanar spacing gradually increased. The impedance spectra analysis showed that conductivity first increased (x = 0~0.2) and then decreased with the Gd^{3 +} doping increase. The total conductivities at 800^oC were 3.8 × 10^-3 S·cm^-1 (x = 0), 8.0 × 10^-3 S· cm^-1 (x = 0.1), 2.5 × 10^-2 S· cm^-1 (x = 0.2), 1.36 × 10^-2 S ·cm^-1 (x = 0.3). Chemical stability test in CO₂ show that all samples except for x=0.3 sample calcination at 800^oC for 2h under 100% CO₂ and x=0, 0.1 samples heating in boiling water for 12h kept main perovskite structure. Therefore, x=0.1 sample show better electrical conductivity and chemical stability.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 401-410
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.401
• Online since: March 2016
• Authors: Jia Huan Xu, Wei Han, Hui Ding, Wei Jin Chen, Jun Xiang
• Keywords: BaCeO₃, Doping, Proton Conductors, Solid Oxide Fuel Cell

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