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<p>Thermal and mechanical properties are important parameters for high-precision piezoelectric actuators. In this work, 0.76Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub>–0.24SrTiO<sub>3</sub>-<i>x</i>wt% CeO<sub>2</sub> (abbreviated as BNST24-<i>x</i>Ce) lead-free ceramics are found to have a large electrostrain of 0.176%, and a normalized strain (<i>S</i><sub>max</sub>/<i>E</i><sub>max</sub>) of 880 pm/V under an ultra-low driving field of 2 kV/mm. The BNST24-0.05Ce lead-free ceramics showed the representative parameters of Young’s modulus <i>E</i> ~ 142.1 GPa, Vickers indentation hardness <i>H</i><sub><i>v</i></sub> ~ 4.25 GPa, fracture toughness <i>K</i><sub>IC</sub> ~ 1.36 MPa·m<sup>1/2</sup>, thermal conductivity <i>λ</i> ~ 1.392 W&#xa0;m<sup>−1</sup>&#xa0;k<sup>−1</sup>, and coefficient of thermal expansion values <i>CTE</i> ~ 9.20 × 10<sup>−6</sup>&#xa0;K<sup>−1</sup>. These results indicate that these lead-free BNT-ST-based ceramics have excellent strain, thermal, and mechanical properties that meet the requirements for practical applications as piezoelectric actuators.</p>

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Effect of CeO2 on electrical properties, mechanical and thermal performance of 0.76Bi1/2Na1/2TiO3–0.24SrTiO3 lead-free piezoelectric ceramics

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Zong-Zheng Du,
  • Guo-Zheng Zhang,
  • Yu-Ting Yang,
  • Xing-Ye Tong,
  • Hong Liu

摘要

Thermal and mechanical properties are important parameters for high-precision piezoelectric actuators. In this work, 0.76Bi1/2Na1/2TiO3–0.24SrTiO3-xwt% CeO2 (abbreviated as BNST24-xCe) lead-free ceramics are found to have a large electrostrain of 0.176%, and a normalized strain (Smax/Emax) of 880 pm/V under an ultra-low driving field of 2 kV/mm. The BNST24-0.05Ce lead-free ceramics showed the representative parameters of Young’s modulus E ~ 142.1 GPa, Vickers indentation hardness Hv ~ 4.25 GPa, fracture toughness KIC ~ 1.36 MPa·m1/2, thermal conductivity λ ~ 1.392 W m−1 k−1, and coefficient of thermal expansion values CTE ~ 9.20 × 10−6 K−1. These results indicate that these lead-free BNT-ST-based ceramics have excellent strain, thermal, and mechanical properties that meet the requirements for practical applications as piezoelectric actuators.