Broadband dielectric spectroscopy on single-crystalline and ceramic CaCu_(3)Ti_(4)O_(12)

摘要

The authors present dielectric measurements of the colossal dielectric constant materialCaCu_(3)Ti_(4)O_(12) 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.