High permittivity, low dielectric loss, and high electrostatic potential barrier in Ca2Cu2Ti4O12 ceramics

Abstract Dielectric and nonlinear current–voltage properties of Ca2Cu2Ti4O12 (CaCu3Ti4O12/CaTiO3 composite) ceramics prepared by a simple thermal decomposition method were investigated. The results revealed that ceramics sintered at 1100 °C for 12 h exhibited a high dielectric constant (e′ ~ 4.05 × 103) with temperature coefficient less than ± 15% in the temperature range of − 55–85 °C, low loss tangent (tanδ ~ 0.046) at 30 °C and 1 kHz, and high electronic potential barrier height (ΦB = 0.856 eV). These are desirable for applications based on the capacitive component. e′ and ΦB increased significantly with increasing sintering time. tanδ was nearly constant. It suggests that a high value of ΦB is caused by the effect of CCTO–CTO interface.