Properties of CCTO, a High Dielectric Constant Material*

CaCu₃Ti₄O₁₂ (CCTO) shows an extremely high dielectric constant, which, in contrast to ferroelectrics like BaTiO₃, is nearly constant in a broad temperature range. Thus, this material has attracted tremendous attention due to its possible applications, e.g., for enhancing the performance of capacitive electronic elements. We used a simple Sol-Gel technique and established a novel composition of CCTO with high dielectric constant, and fabricated stable and reliable thin films. We have successfully incorporated silver nanoparticle in CCTO thin films. The conducting metal particles dispersed in a dielectric matrix are known to increase the effective dielectric constant of the medium. Based on these novel materials, we developed tunable multilayer capacitor with high dielectric constant.