【摘要】 采用溶胶-凝胶法制备了AlO1.5掺杂浓度为0.5%,1.0%,2.0%的AlO1.5/Ce0.8Gd0.15Y0.05O2-δ固体电解质材料,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和交流阻抗谱研究了Al2O3掺杂对Ce0.8Gd0.15Y0.05O2-δ微观结构及电性能的影响,结果表明:800℃焙烧的所有粉末样品均为单相立方萤石结构,在所有样品中,AlO1.5掺杂量为0.5%的样品晶粒均匀,较致密,交流阻抗谱测试表明掺杂AlO1.5(x=0.5%)使Ce0.8Gd0.15Y0.05O2-δ晶界电阻减小,晶界电导率增高;当AlO1.5掺杂量x≥1%时,Al2O3对晶界的阻塞作用使晶界电导率降低,在所有样品中Ce0.8Gd0.15Y0.05O2-δ/0.5%AlO1.5晶界电导率最高(σ700℃=8.12×10-3S/cm),说明在Ce0.8Gd0.15Y0.05O2-δ少量掺杂AlO1.5(x=0.5%)具有烧结助剂和晶界清除剂的作用.更多还原

【Abstract】 AlO1.5/Ce0.8Gd0.15Y0.05O2-δ solid electrolytes,with AlO1.5 concentrations ranging from 0.5% to 2% were prepared by sol-gel method.The effects of AlO1.5doping on the microstructure and conductivity were discussed by means of X-ray diffraction(XRD),scanning electron microscopy(SEM) and AC impedance spectroscopy.The results show that all powders calcined at 800℃ are crystallized in a single cubic fluorite structure.The sample doping with 0.5% AlO1.5is more uniform and relative dense.AC impedance spectra analysis suggests that AlO1.5(x =0.5%)make the grain boundary resistance of Ce0.8Gd0.15Y0.05O2-δdecrease and the grain boundary conductivity increase.When AlO1.5 dopant concentration is over 1%,the grain boundary conductivity begins to reduce because of blocking effect of AlO1.5particles at grain boundaries in all samples.The grain boundary conductivity of AlO1.5/ Ce0.8Gd0.15Y0.05O2-δ reaches the maximum,σ700℃= 8.12 × 10-3S /cm,which suggests that doping with a little AlO1.5(x =0.5%)in Ce0.8Gd0.15Y0.05O2-δ have the effective sintering aids and grain boundary scavengers.更多还原