Valence compensated perovskite oxide system Ca1− xLa xTi1− xCr xO3 Part II Electrical transport behavior.

Electrical transport behaviour of the valence compensated system Ca_{1− x}La _xTi_{1− x}Cr _xO ₃( x≤ 0.50) has been investigated by studying the Seebeck co-efficient, DC and AC conductivity as a function of temperature. Seebeck co-efficient, DC conductivity of different compositions has been measured in the temperature range 300 K–1000 K. AC conductivity for different compositions were determined in the temperature range 100–550 K and frequency range 10 Hz–10 MHz. Positive values of Seebeck co-efficient show that holes are the majority charge carriers. Conduction seems to occur by correlated barrier hopping of holes among Cr³⁺and Cr⁴⁺ions or V_O ^•and V_O ^••. Almost equal values of activation energies obtained for DC conductivity and dielectric relaxation process show that both the processes occur by the same mechanism. [ABSTRACT FROM AUTHOR]