Broadband dielectric spectroscopy on single-crystalline and ceramic Ca Cu3 Ti4 O12

Abstract

The authors present dielectric measurements of the colossal dielectric constant material Ca Cu3 Ti4 O12 extending up to 1.3 GHz also covering so far only rarely investigated single-crystalline samples. Special emphasis is put on the second relaxation reported in several works on polycrystals, which the authors detect also in single crystals. For polycrystalline samples, the authors provide a recipe to achieve values of the dielectric constant as high as in single crystals. © 2007 American Institute of Physics.