Study of the effect of the substitution of Fe by Ti on the microstructure and the physical properties of the perovskite system La0.67Ca0.2Ba0.13Fe1−xTixO3 with x = 0 and 0.03 at low temperatures

Frequency response of ac conductivity at several temperatures and conduction mechanisms for La 0.67 Ca 0.2 Ba 0.13 Fe 1− x Ti x O 3 samples ( x = 0 and 0.03).