The enhanced dielectric response of (Ba, Sr)TiO3-Y2/3Cu3Ti4O12/TiO2 composite ceramics
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Ba 1-x Sr x TiO 3 -Y 2/3 Cu 3 Ti 4 O 12 /TiO 2 composite ceramics (x = 0, 0.1, 0.2, 0.3, 0.4) were successfully synthesized via solid-state reaction and sintering at 1100°C. XRD analysis reveals minor secondary phases Ba 2 Ti 5 O 12 , CuO, and Y 2 Ti 2 O 7 formed through decomposition and recombination during sintering. Microstructural characterization confirms a pomegranate-like distribution of YCTO/TiO₂ particles within the matrix. The ceramics exhibit high dielectric constants (4837-2.44×10 4 , at 25 Hz), which decrease with increasing Sr content alongside reduced dielectric losses. At Ba/Sr = 6/4, an optimal temperature stability is achieved with dielectric constant variation within ±15% in the temperature range from -40 to 125 o C. The frequency dependencies of dielectric properties and impedance spectra demonstrate that the enhanced dielectric response is assigned to Debye-like relaxation. The colossal dielectric response is attributed to the synergistic effect of spontaneous polarization of ferroelectric BaTiO 3 , electronic polarization of YCTO, and hierarchical interface polarization.
