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. 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. 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 embodied poor sinterability with increasing Y-doping content. TGM curve 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 showing that conductivities of BaZr1-x YxO3-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 d oped amount of Y, and reached the highest value of 1.07 × 10 -3 S / cm when x was 0.2, then gradually 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 that the Y-doping concentration is helpful to improve the conductivities of BaZr1-x Yx O3-αmaterials at low temperature.