Linear and nonlinear dielectric properties of (CuO)_1-x/(BaTiO₃)_x composites

Abstract

The temperature dependences of the dielectric constant ε' and the third harmonic coefficient γ_3ω for composite ceramics (СuO)_1-x/(BaTiO₃)_x in the temperature range 100–300 K were studied. It is shown that the ε´(T) dependence for СuO has insignificant anomalies at transition temperature Т_N2 = 230 K. The maximum values of the third harmonics fit in the middle of the temperature interval [Т_N1; T_N2]. With an increase in the content of barium titanate, an increase in the dielectric constant and a shift of the polar region toward low temperatures are observed.

Keywords:

• Multiferroics
• phase transitions
• dielectric constant