DIELECTRIC AND CONDUCTION PROPERTIES IN NICKEL DOPED BARIUM STRONTIUM-TITANATE CERAMICS

Electrical properties of defect structure in Ni-doped (Ba1 - xSrx)TiO3 ceramics were studied by means of electron spin resonance (ESR), ther mally stimulated current (TSC), dielectric and conduction measurements . A set of experimental results revealed that the nickel cations were located on the B-site of the perovskite in the form of Ni2+ and mainly Ni3+ lending to a slight increase of the diffusion characteristics of the para-ferroelectric transition and that the enhanced electric cond uction observed at high temperatures is due to oxygen vacancy migratio n towards the cathode.