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<p>High-temperature lead-free piezoelectric ceramics Ca(La<sub><i>x</i></sub>Bi<sub>1−<i>x</i></sub>)<sub>4</sub>Ti<sub>4</sub>O<sub>15</sub>(CBT-<i>x</i>La, <i>x</i> = 0 to 0.12) by La<sup>3+</sup> ions modified were prepared using a conventional solid-phase reaction method. Based on different La<sup>3+</sup> doping content, the phase structures, dielectric, ferroelectric and piezoelectric properties of CBT-<i>x</i>La ceramics are investigated systematically. The addition of trace La<sup>3+</sup> dopant does not cause significant change in the crystal lattice structure of CBT ceramics, but the ferroelectric-paraelectric phase transition temperature (<i>Tc</i>) decrease from 790&#xa0;°C to 600&#xa0;°C with the increase of La<sup>3+</sup> content. This is because the 6s<sup>2</sup> lone electrons of Bi<sup>3+</sup> ions have a weakened effect with the decrease of Bi<sup>3+</sup> content, the substitution of La<sup>3+</sup> reduces the structural distortion of original crystal structure. Besides, the grain size decreases significantly with the increase of La<sup>3+</sup> content, from 0.57&#xa0;μm to 0.39&#xa0;μm. In addition, the oxygen vacancies were reduced by La<sup>3+</sup> doping, which lead to improvement of the electrical properties for CBT ceramics effectively. Especially, CBT-0.01La is the optimal component with the best ferroelectric and piezoelectric properties with good thermal stability, a remnant polarization of <i>P</i><sub><i>r</i></sub> = 29.7 µC/cm² and a piezoelectric constant of <i>d</i><sub><i>33</i></sub> = 13 pC/N were achieved. This work provides a promising candidate for high-temperature piezoelectric materials.</p>

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Improvement of electrical properties for CaBi4Ti4O15 piezoelectric ceramics by rare earth La3+ modification

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Wanqi Tang,
  • Tongxiang Liang,
  • Ying Liu,
  • Dongfang Pang

摘要

High-temperature lead-free piezoelectric ceramics Ca(LaxBi1−x)4Ti4O15(CBT-xLa, x = 0 to 0.12) by La3+ ions modified were prepared using a conventional solid-phase reaction method. Based on different La3+ doping content, the phase structures, dielectric, ferroelectric and piezoelectric properties of CBT-xLa ceramics are investigated systematically. The addition of trace La3+ dopant does not cause significant change in the crystal lattice structure of CBT ceramics, but the ferroelectric-paraelectric phase transition temperature (Tc) decrease from 790 °C to 600 °C with the increase of La3+ content. This is because the 6s2 lone electrons of Bi3+ ions have a weakened effect with the decrease of Bi3+ content, the substitution of La3+ reduces the structural distortion of original crystal structure. Besides, the grain size decreases significantly with the increase of La3+ content, from 0.57 μm to 0.39 μm. In addition, the oxygen vacancies were reduced by La3+ doping, which lead to improvement of the electrical properties for CBT ceramics effectively. Especially, CBT-0.01La is the optimal component with the best ferroelectric and piezoelectric properties with good thermal stability, a remnant polarization of Pr = 29.7 µC/cm² and a piezoelectric constant of d33 = 13 pC/N were achieved. This work provides a promising candidate for high-temperature piezoelectric materials.