Evidence for internal resistive barriers in a crystal of the giant dielectric constant material: CaCu_3Ti_4O_(12)

摘要

Complex impedance spectra were obtained on a crystal of CaCu_3Ti_4O_(12)(CCTO) from 289 to 456 K. As in the case of ceramic CCTO, these spectra can be interpreted as arising from a conducting material containing insulating barriers. This is then further evidence for the existence of planar defects within crystals of CCTO that act as insulating barriers and produce the large dielectric constant through a space charge mechanism.