ELECTRICAL BEHAVIOR OF LANTHANUM-DOPED AND COBALT-DOPED STRONTIUM STANNATE

Electrical properties of lanthanum- and cobalt-doped strontium stannat e, SrSnO3, have been studied as a function of temperature. All the com positions investigated have cubic structure. Measurement of Seebeck co efficient in one of the cobalt-doped SrSnO3 sample shows that it exhib its p-type conductivity. Results of AC conductivity measurements show that conduction occurs by hopping of charge carriers in lanthanum-dope d samples and for x = 0.01 in cobalt-doped sample. In x = 0.05 sample in cobalt-doped system, conduction seems to occur in extended states.