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Lead-Free Piezoelectric Acceleration Sensor Built Using a (K,Na)NbO3 Bulk Ceramic Modified by Bi-Based Perovskites.

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Lead-free (Potassium Sodium Niobate) KNN piezoceramics modified with Bi-based perovskites were developed for advanced piezoelectric accelerometers. These novel ceramics exhibit excellent charge sensitivity and reliability for sensor applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Ceramic Engineering

Background:

  • Lead-free piezoceramics are crucial for sustainable electronic devices.
  • Lead-free (Potassium Sodium Niobate) KNN ceramics offer promising piezoelectric properties.
  • Developing high-performance piezoelectric accelerometers requires advanced ceramic materials.

Purpose of the Study:

  • To design and fabricate lead-free (Potassium Sodium Niobate) KNN-based piezoelectric accelerometers.
  • To enhance piezoelectric properties by modifying KNN with Bi-based perovskites: Bi(Na,K,Li)ZrO3 (BNKLZ) and BiScO3 (BS).
  • To optimize accelerometer designs for high charge sensitivity and resonant frequency.

Main Methods:

  • Conventional solid-state reaction method for preparing ring-shaped KNN-BNKLZ-BS ceramics.
  • Finite element analyses with metamodeling techniques for accelerometer design optimization.
  • Fabrication and characterization of accelerometer sensor prototypes.

Main Results:

  • Modified KNN ceramics achieved a large piezoelectric charge coefficient (d33) of 310 pC/N and a high Curie temperature (Tc) of 331 °C.
  • Optimized accelerometer designs exhibited high charge sensitivity (Sq) and resonant frequency (fr).
  • Fabricated prototypes demonstrated high Sq (55.1 to 223.8 pC/g) and mounted fr (14.1 to 28.4 kHz) with excellent linearity and reliability.

Conclusions:

  • The modified KNN-BNKLZ-BS ceramic exhibits excellent piezoelectric properties suitable for accelerometer applications.
  • Optimized accelerometer designs demonstrate high performance and reliability.
  • These lead-free piezoelectric sensors hold significant potential for various sensing applications.