Abstract: La_1-xM_xFe_yCo_1-yO₃(M=Sr,Ba,x=0.1～0.9,y=0.1～0.9) have been prepared. The crystal of La_0.7Sr_0.3Fe_yCo_1-yO₃(y=0.1,0.3) is rbombohedral. The crystal of other compounds is cubic. The lattice parameters of La_1-xM_xFe_yCo_1-yO₃ increase with increasing the yvalue. The lattice parameters of La_1-xSr_xFe_0.7Co_0.3O₃ decrease with the increase of the x value, but that of La_1-xBa_xFe_0.7Co_0.3O₃ increase with the increase of the x value. All the compounds are semiconductors. Their resistivities increase with increasing the y value when x=0.3; decrease with increasing the x value when y=0.7 and x=0.1～0.5; and increase with increasing the x value when y=0.7 and x=0.5～0.9.

Key words: rare earth complex oxide, iron oxide, cobalt oxide, electric property