The lattice parameters, electrical conductivity, activation energy, mechanical properties, and microstructure of (La 0.8 Ca 0.2 )CrO 3Àd -based specimens were investigated systematically in this paper. The tolerance factors for (La 0.8 Ca 0.2 )CrO 3Àd -based specimens were all greater than 0.9, indicating the perovskite was not distorted with different cations (Al 3þ , Co 3þ , Cu 2þ , Fe 3þ ) substitution for B site of (La 0.8 Ca 0.2 )CrO 3Àd . (La 0.8 Ca 0.2 )Cr 0.9 Co 0.1 O 3Àd specimen revealed the maximum electrical conductivity, s 850 C ¼ 59.59 S/cm with minimum activation energy, E a ¼ 11.2 kJ/mol among (La 0.8 Ca 0.2 )CrO 3Àd -based specimens. The grain size seemed dependent on doping species and the grain sizes were distributed in the range of 2.4e5.6 mm for (La 0.8 Ca 0.2 )CrO 3Àd -based specimens. The rate of grain growth was proportional to the boundary mobility M b , which was related to the diffusion coefficient of doping cation. (La 0.8 Ca 0.2 )CrO 3Àd -based specimens revealed variety in microhardness, in the range of 4.33e9.85 GPa and the fracture toughness were distributed in the range of 3.52e4.33 MPa m 1/2 . Based on the results in terms of grain size and mechanical properties, we concluded that the microhardness and fracture toughness were dependent on the dopant ions. The (La 0.8 Ca 0.2 )Cr 0.9 Co 0.1 O 3Àd specimen shows high electrical conductivity and mechanical properties Consequently, it is a promising candidate as an interconnect material for intermediate temperature solid oxide fuel cell (IT-SOFC) applications.