Variation of optimum yttrium doping concentrations of perovskite type proton conductors BaZr1–xYxO3–α（0≤x≤0.3） with temperature
来源期刊：Journal of Rare Earths2013年第10期
论文作者：丁玉石 厉英 邓文卓 黄文龙 王常珍
文章页码：1017 - 1022
摘 要：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.
丁玉石，厉英，邓文卓，黄文龙，王常珍
School of Materials and Metallurgy, Northeastern University
摘 要：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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