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<p>Ba<sub>1−x</sub>Sr<sub>x</sub>TiO<sub>3</sub>-Y<sub>2/3</sub>Cu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub>/TiO<sub>2</sub> composite ceramics (x = 0, 0.1, 0.2, 0.3, 0.4) were successfully synthesized via solid-state reaction and sintering at 1100&#xa0;°C. XRD analysis reveals minor secondary phases Ba<sub>2</sub>Ti<sub>5</sub>O<sub>12</sub>, CuO, and Y<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> 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<sup>4</sup>, at 25&#xa0;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&#xa0;°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<sub>3</sub>, electronic polarization of YCTO, and hierarchical interface polarization. </p>

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The enhanced dielectric response of (Ba, Sr)TiO3-Y2/3Cu3Ti4O12/TiO2 composite ceramics

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Haidong Wang,
  • Jiewei Zuo,
  • Hongdeng Zheng,
  • Jingchang Zhao

摘要

Ba1−xSrxTiO3-Y2/3Cu3Ti4O12/TiO2 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 Ba2Ti5O12, CuO, and Y2Ti2O7 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 × 104, 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 °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 BaTiO3, electronic polarization of YCTO, and hierarchical interface polarization.