Output details
13 - Electrical and Electronic Engineering, Metallurgy and Materials
University of Sheffield : B - Materials Science and Engineering
Comment on the origin(s) of the giant permittivity effect in CaCu3Ti4O12 single crystals and ceramics
There is a major drive to introduce new ceramic capacitors with higher capacitance and improved temperature stability (1 trillion produced annually). We use impedance spectroscopy to resolve an on-going controversy (>800 publications since 2000) regarding the origin of giant permittivity in calcium copper titanate (CCTO) (DOI: 10.1006/jssc.2000.8703 and 10.1126/science.1061655). We demonstrated that the origin of the permittivity is an extrinsic not an intrinsic effect but different for single crystals and ceramics. This work resolved the debate of giant permittivity in CCTO materials and has resulted in several invited talks at international conferences, e.g. European Materials Research Society (E-MRS) 2009.