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<p>Piezoelectric ceramics are widely used in aviation, aerospace, communications, weapons, electronics and other high-tech fields. This study focuses on high piezoelectric Pb(Nb<sub>2/3</sub>Ni<sub>1/3</sub>)O<sub>3</sub>-Pb(Hf<sub>1/2</sub>Ti<sub>1/2</sub>)O<sub>3</sub> (PNN-PHT) binary ceramic as the research matrix. By doping Li<sub>2</sub>CO<sub>3</sub>, the Curie temperature is increased, and the effects of doping concentration on microstructure, phase structure, and electrical performances of the ceramics are discussed. The study found that all ceramics were rhombohedral -tetragonal mixed phases, and no impurity phases were generated. When <i>x</i> = 0.20, the samples have the best mass density <i>ρ</i> = 8.0291&#xa0;g/cm<sup>3</sup>, the best piezoelectric constant <i>d</i><sub>33</sub> = 702 pC/N, the largest signal piezoelectric constant <i>d</i><sub>33</sub>* = 943 pm/V, the largest strain value <i>S</i> = 0.56%, the highest electromechanical coupling coefficient <i>k</i><sub>p</sub> = 51.9%, excellent hardness <i>H</i> = 4.5221 GPa and fracture toughness <i>K</i><sub>IC</sub> = 1.06 MPa•m<sup>0.5</sup>, and a higher Curie temperature <i>T</i><sub>C</sub> = 155 <sup>o</sup>C. At the same time, the <i>x</i> = 0.20 sample has excellent temperature stability in 20 ~ 150 <sup>o</sup>C, achieving a balance and compromise between piezoelectric properties and temperature stability.</p>

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Piezoelectric, ferroelectric and mechanical properties of Li-doped PNN-PHT ceramics

  • 期刊论文

  • 发表日期：

    2025年4月26日

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  • Wenjing Bi,
  • Jingwen Sun,
  • Chenyang Zhang,
  • Yunfei Bai,
  • Shichao Zhou,
  • Xinyang Gao,
  • Heming Li,
  • Tianzi Yin,
  • Yi Zhang,
  • Jigong Hao,
  • Juan Du,
  • Peng Li,
  • Peng Fu,
  • Chaolei Ban,
  • Wei Li

摘要

Piezoelectric ceramics are widely used in aviation, aerospace, communications, weapons, electronics and other high-tech fields. This study focuses on high piezoelectric Pb(Nb2/3Ni1/3)O3-Pb(Hf1/2Ti1/2)O3 (PNN-PHT) binary ceramic as the research matrix. By doping Li2CO3, the Curie temperature is increased, and the effects of doping concentration on microstructure, phase structure, and electrical performances of the ceramics are discussed. The study found that all ceramics were rhombohedral -tetragonal mixed phases, and no impurity phases were generated. When x = 0.20, the samples have the best mass density ρ = 8.0291 g/cm3, the best piezoelectric constant d33 = 702 pC/N, the largest signal piezoelectric constant d33* = 943 pm/V, the largest strain value S = 0.56%, the highest electromechanical coupling coefficient kp = 51.9%, excellent hardness H = 4.5221 GPa and fracture toughness KIC = 1.06 MPa•m0.5, and a higher Curie temperature TC = 155 oC. At the same time, the x = 0.20 sample has excellent temperature stability in 20 ~ 150 oC, achieving a balance and compromise between piezoelectric properties and temperature stability.