ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 32, Number 1
JKCSEZ 32(1)
February 20, 1988 

Perovskite type compounds of the La_1-xCa_xFeO_3-y system were prepared from stoichiometric mixtures of La2O3, CaCO3, and Fe(NO3)3·9H2O by heating at 1100℃ for 24 hours. The crystallographic structures of the solid solutions of all compositions were orthorhombic systems. X-ray diffraction and Mohr salt analysis revealed that at higher y value the phase transition due to vacancy ordering occured and that the lattice volume decreased when the x value was increased. The value of nonstoichiometric ratio y were found to be in the range of 0.0∼0.5. Electrical conductivities of this systems are measured in temperature range of -100 to 100℃. Ionic contribution to total conductivity was found from activation energy in the phase containing the open pathway due to vacancy ordering.