講座內(nèi)容： It’s about how to probe the 'electrical microstructure', to understand the electrical conduction mechanisms and defect chemistry in electro ceramics using various electrical characterization techniques, particularly Impedance Spectroscopy. Three examples will be discussed:(i) the discovery of a completely new family of oxide ion conductors(electrolyte for solid oxide fuel cells) based on a conventional ferroelectric/piezoelectric material; (ii)influence of nonstoichiometry on extrinsic electrical conduction and dielectricloss in microwave dielectric ceramics; (iii) a general strategy on probing the origins of giant permittivity in electro ceramics.