The SOFC interconnect materials La0.7Ca0.3Cr1-xO3-delta (X=0-0.09) were prepared using an auto-ignition process and characterized. XRD analysis indicated that all the samples displayed a pure perovskite phase after sintered at 1400 degrees C for 4 h. The relative density increased from 67% (x = 0) to 95.8% (x = 0.02) and reached to about 97% (x > 0.02), as sintered at 1400 degrees C for 4 h. The electrical conductivity in air dramatically increased and then lowered slowly with x values. The sample with 0.03 Cr deficiency got a maximum conductivity of 61.7 S cm(-1) at 850 degrees C in air, which is about three times as high as that of the sample with no Cr deficiency (20.6 S cm(-1)). The sample with 0.06 Cr deficiency exhibited the highest electrical conductivity of 3.9 S cm(-1) at 850 degrees C in pure H,. The thermal expansion coefficient (TEC) were below 11.8 x 10(-6) K-1 for samples of x = 0.02-0.09, that was of well compatibility with other components in SOFCs. Results indicate that the materials with 0.02-0.06 Cr deficiency have high properties and are much suitable for SOFC interconnect. (C) 2007 Elsevier Ltd. All fights reserved.