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Variation of optimum yttrium doping concentrations of perovskite type proton conductors BaZr1–xYxO3–α(0≤x≤0.3) with temperature
Author(s): 
Pages: 1017-1022
Year: Issue:  10
Journal: Journal of Rare Earths

Keyword:  BaZr1–x Yx O3–αproton conductorsconductivityoptimum doping concentrationEISrare earths;
Abstract: A solid state reaction method was used to prepare the perovskite-structured compounds BaZr1–x Yx O3–α(x=0, 0.05, 0.1, 0.15,0.2, 0.25, 0.3). The X-ray diffraction(XRD) pattern indicated that the target perovskite phases were obtained. With increasing Y concentration the unit cell parameters of BaZr1–x Yx O3–αsamples were expanded, and Y doping became more difficult. However, high synthesis temperature is helpful to promote Y doping. The SEM results showed that the samples exhibited poor sinterability with increasing Y-doping content. Thermal gravimetric(TG) curves analysis showed the more mass decreasing of BaZr1–x Yx O3–α(0≤x≤0.3)samples at high temperature with more Y doping and more proton introducing. The electrochemical impedance spectra(EIS) of specimens showed that conductivities of BaZr1–x Yx O3–α(0≤x≤0.3) increased with increasing temperature from 300 to 900 °C in wet air. At 900 °C, the conductivity of BaZr1–x Yx O3–α(0≤x≤0.3) first increased with increasing doped amount of Y, and reached the highest value of 1.07×10–3S/cm when x was 0.2, then decreased gradually with further increasing Y content. At 600 °C, BaZr0.75Y0.25O3–αdisplayed the highest conductivity, while the conductivity of BaZr0.7Y0.3O3–αwas the highest at 300 °C. The results indicated that there should be an optimum Y doping concentration yielding the highest conductivity at a constant temperature, and the optimum Y doping concentration should increase in the humidity atmosphere as the temperature decreases. So increasing the Y-doping concentration is helpful to improve the conductivities of BaZr1–x Yx O3–αmaterials at low temperature.
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