The electronic and ionic conductivities of Ln0.6Sr0.4Co1-yFeyO3 (y=0.2, 0.8) ceramics were evaluated by a dc four-terminal method and ac impedance spectroscopy using a two-terminal blocking electrode method, respectively.

• 分别采用直流四探针法和交流阻抗谱研究了Ln_(0.；6)Sr_(0