On some transport properties of strontium-doped lanthanum chromite ceramics

D.C. Electrical conductivity, Hall mobility and magnetic susceptibility measurements on La_1?x Sr _x CrO₃ (0?x?0.25) perovskite ceramic system, and their temperature dependence, have been carried out to understand the nature of the transport mechanism in them. The electrical conductivity and Hall mobility displayed thermally activated temperature dependence with activation energies that varied from 0.13 to 0.23 ev. The variation of the d.c. conductivity of the polycrystalline La_1?x Sr _x CrO₃ with strontium content (X) has been found to be strongly affected by the changes in microstructure. Magnetic susceptibility data indicate that the electronic transport is due to the presence of Cr⁴⁺ ions in the lattice, and that the localized level of hopping is associated with the chromium 3d band.