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<p>Al<sub>2</sub>O<sub>3</sub>–TeO<sub>2</sub>-co-doped 0.8Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.2Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> ceramics (0.8BNT-0.2BKT-<i>x</i>AT, <i>x</i> = 0.05/0.16) were synthesized via conventional solid-state reaction. Systematic investigation of dispersant effects revealed polyvinylpyrrolidone (PVP)-modified 0.8BNT-0.2BKT-0.05AT samples demonstrated optimal microstructural characteristics with maximum of 97.5% relative density. Dielectric analysis showed room-temperature permittivity reduction upon dispersant incorporation, while phase transition temperatures were increased, particularly in PVP-modified samples (ε<sub>r</sub> = 5264 at 1&#xa0;kHz at 290&#xa0;°C). Thermogravimetric measurement indicated a 73.52% solid content in the PVP-based slurries. The optimized slurry exhibited proper rheological performances: viscosity of 236&#xa0;Pa&#xa0;s, recovery efficiency of 87.7%, and thixotropic index of 4.69. The optimized slurry also demonstrated a dual sensing functionality in the screen-printed thick-film form, i.e., as a temperature and force sensor. Resistivity analysis revealed a positive temperature coefficient (PTC) behavior of the sensor from room temperature to 145 °C (with a linear regression goodness of <i>R</i><sup>2</sup> &gt; 0.9) and then a negative temperature coefficient (NTC) behavior above 260&#xa0;°C (<i>R</i><sup>2</sup> &gt; 0.9 up to 400&#xa0;°C). Piezoelectric evaluation demonstrated a peak output voltage of 0.0224&#xa0;V under 0.2&#xa0;N loading, confirming simultaneous temperature and force sensing capabilities. The current study demonstrates the material’s promising application potential in temperature and force/pressure sensing.</p>

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Preparation and properties of Al- and Te-co-doped BNT-BKT ceramic slurry and its sensor applications

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • Jinling Zeng,
  • Jie Huang,
  • Yingbang Yao

摘要

Al2O3–TeO2-co-doped 0.8Bi0.5Na0.5TiO3-0.2Bi0.5K0.5TiO3 ceramics (0.8BNT-0.2BKT-xAT, x = 0.05/0.16) were synthesized via conventional solid-state reaction. Systematic investigation of dispersant effects revealed polyvinylpyrrolidone (PVP)-modified 0.8BNT-0.2BKT-0.05AT samples demonstrated optimal microstructural characteristics with maximum of 97.5% relative density. Dielectric analysis showed room-temperature permittivity reduction upon dispersant incorporation, while phase transition temperatures were increased, particularly in PVP-modified samples (εr = 5264 at 1 kHz at 290 °C). Thermogravimetric measurement indicated a 73.52% solid content in the PVP-based slurries. The optimized slurry exhibited proper rheological performances: viscosity of 236 Pa s, recovery efficiency of 87.7%, and thixotropic index of 4.69. The optimized slurry also demonstrated a dual sensing functionality in the screen-printed thick-film form, i.e., as a temperature and force sensor. Resistivity analysis revealed a positive temperature coefficient (PTC) behavior of the sensor from room temperature to 145 °C (with a linear regression goodness of R2 > 0.9) and then a negative temperature coefficient (NTC) behavior above 260 °C (R2 > 0.9 up to 400 °C). Piezoelectric evaluation demonstrated a peak output voltage of 0.0224 V under 0.2 N loading, confirming simultaneous temperature and force sensing capabilities. The current study demonstrates the material’s promising application potential in temperature and force/pressure sensing.