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<p>Synthesis of Na<sub>0.5</sub>Bi<sub>2.5</sub>Nb<sub>2</sub>O<sub>9</sub>-<i>x</i>wt%CuO (NBNO-<i>x</i>wt%Cu, <i>x</i> = 0.0, 0.2, 0.5, 0.8, 1.0) piezoelectric ceramics by the conventional solid phase method. XRD analysis confirms that all samples have single bismuth layer structure. Raman further demonstrated that the substitution of Cu<sup>2+</sup> for the B-site Nb<sup>5+</sup> leads to a greater distortion of the structure of the [NbO<sub>6</sub>] octahedra. The microstructural results of the samples indicate that Cu<sup>2+</sup> promotes grain growth, with <i>x</i> = 0.8 having the largest grain size. These results showed that both the Curie temperature (<i>T</i><sub>C</sub>) and piezoelectric constant (<i>d</i><sub>33</sub>), from 772 to 788&#xa0;°C and from 11 to 18.4&#xa0;pC/N, respectively. Furthermore, the sample with<i> x</i> = 0.8 exhibits excellent heat stability. The <i>d</i><sub>33</sub> was maintained at 17.4&#xa0;pC/N after 2&#xa0;h of holding at 750&#xa0;°C. Moreover, the electrical resistivity of Na<sub>0.5</sub>Bi<sub>2.5</sub>Nb<sub>2</sub>O<sub>9</sub>-0.8wt%CuO can achieve 2.5 × 10<sup>6</sup>&#xa0;Ω·cm at 500&#xa0;°C. This new method can be used to modify Na<sub>0.5</sub>Bi<sub>2.5</sub>Nb<sub>2</sub>O<sub>9</sub> ceramics for use at high temperatures.</p>

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The effect of CuO on the structure and electrical properties of Na0.5Bi2.5Nb2O9 piezoelectric ceramics

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Ting Xiong,
  • Zhiwei Song,
  • Xiangping Jiang,
  • Chao Chen,
  • Chong Zhao,
  • Renfen Zeng,
  • Benjin Xu,
  • Han Xu,
  • Hehong Zhang,
  • Na Tu,
  • Yunjing Chen

摘要

Synthesis of Na0.5Bi2.5Nb2O9-xwt%CuO (NBNO-xwt%Cu, x = 0.0, 0.2, 0.5, 0.8, 1.0) piezoelectric ceramics by the conventional solid phase method. XRD analysis confirms that all samples have single bismuth layer structure. Raman further demonstrated that the substitution of Cu2+ for the B-site Nb5+ leads to a greater distortion of the structure of the [NbO6] octahedra. The microstructural results of the samples indicate that Cu2+ promotes grain growth, with x = 0.8 having the largest grain size. These results showed that both the Curie temperature (TC) and piezoelectric constant (d33), from 772 to 788 °C and from 11 to 18.4 pC/N, respectively. Furthermore, the sample with x = 0.8 exhibits excellent heat stability. The d33 was maintained at 17.4 pC/N after 2 h of holding at 750 °C. Moreover, the electrical resistivity of Na0.5Bi2.5Nb2O9-0.8wt%CuO can achieve 2.5 × 106 Ω·cm at 500 °C. This new method can be used to modify Na0.5Bi2.5Nb2O9 ceramics for use at high temperatures.