Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Abstract

Y-doped barium cerate BaCe 0.9 Y 0.1 O 3 − δ was synthesised by a solid-state reaction method. Materials with different average grain sizes and grain boundary surface areas were obtained. The effect of microstructure on the chemical stability in the CO 2 and H 2 O-containing atmosphere and electrical properties was analysed and discussed. To evaluate the chemical stability of BaCe 0.9 Y 0.1 O 3 − δ , the exposure test was performed. Samples were exposed to the carbon dioxide and water vapour-rich atmosphere at 25°C for 700 h. Thermogravimetry supplied by mass spectrometry was applied to analyse the samples before and after this comprehensive test. The mass loss for samples before and after the test and the amount of BaCO 3 formed during the test were directly treated as the measure of chemical instability of BaCe 0.9 Y 0.1 O 3 − δ in the atmosphere rich in carbon dioxide and water vapour. As it was observed, the BaCe 0.9 Y 0.1 O 3 − δ chemical stability towards CO 2 and H 2 O is not affected by the materials' microstructure. Electrical properties of BaCe 0.9 Y 0.1 O 3 − δ which differs with microstructure were determined using electrochemical impedance spectroscopy (EIS). It was found that the grain interior resistivity and activation energy of grain interior conductivity is microstructure independent. However, the effect on microstructure was seen on the EIS spectra in the range of grain boundary contribution. Therefore, the lowest activation energy and the highest conductivity were observed for a material with the lowest grain boundary surface area.

The structure, electrical properties and chemical stability of porous Nb-doped SrTiO3 – experimental and theoretical studies

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Features of Electrophoretic Deposition of a Ba-Containing Thin-Film Proton-Conducting Electrolyte on a Porous Cathode Substrate

“…The processing of the spectra was carried out by a circuit of series-connected resistance R el and three parallel-connected RQ chains. The high-frequency response in the spectrum with a characteristic frequency of 1.5-2 MHz in the wet and dry air, respectively, and with a characteristic capacitance value of~10 -8 F, as widely accepted, refers to the grain boundaries of the electrolyte [33,34]. The electrode response with a characteristic capacitance of~10 −4 F and a characteristic frequency of 1-8 kHz probably refers to oxygen diffusion in the electrode.…”

Toward improved chemical stability of yttrium‐doped barium cerate by the introduction of nickel oxide

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