摘要
采用溶胶-凝胶法制备了单一立方相钙钛矿结构的Y0.06Sr0.94Ti1-xFexO3-δ(x=0.2,0.3,0.4,0.5)混合导体材料,采用交流阻抗法分析了电子-离子总阻抗的Nyquist图,离子阻抗的Nyquist图和Z^lgf频谱图的特性。结果表明,试样以电子电导为主,阻抗随着Fe掺杂量的增大而逐渐减小;从离子阻抗的Z^lgf频谱可以看出,试样离子传导在晶界有一个弛豫过程,Fe的掺杂降低了Y0.06Sr0.94Ti1-xFexO3-δ的弛豫活化能。试样的总电导率和离子电导率都随着Fe的掺杂量的增大而增大,Y0.06Sr0.94Ti0.5Fe0.5O3-δ的总电导率和离子电导率分别为0.088~0.15 S·cm-1和0.00023~0.029 S·cm-1。
Y0. 06Sr0. 94Ti1- xFexO3- δ（ x = 0. 2,0. 3,0. 4,0. 5） mixed conductor with single cubic perovskite was synthesized by sol-gel method. The impedance properties,Nyquist and frequency spectra were investigated by AC impedance spectroscopy. The result indicates that the samples take electronic conduction as the principle thing from the total impedance spectra. From the Nyquist and frequency spectra of ionic conduction,the grain impedance is more than that of the grain boundary and there is a relaxation peak on grain boundary. Fe-doping improves the oxygen ionic conduction of Y0. 06Sr0. 94Ti1- x FexO3- δ. The total electrical and ionic conductivities of Y0. 06Sr0. 94Ti0. 5Fe0. 5O3- δincreases as the Fe doping amount increasing. The total electrical and ionic conductivities is 0. 088-0. 15 S ·cm- 1and 0.00023-0. 029 S·cm- 1,respectively.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第4期1084-1090,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(51362011)
