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Bismuth Ferrite-Based Lead-Free High-Entropy Piezoelectric Ceramics.

Hongtian Li1,2, Jianwei Zhao2, Yong Li3

  • 1College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.

ACS Applied Materials & Interfaces
|February 8, 2024
PubMed
Summary

Entropy engineering created novel lead-free piezoelectric ceramics with excellent performance. This bismuth ferrite-based material shows promise for next-generation actuators and transducers, offering a high-entropy alternative to lead-based options.

Keywords:
bismuth ferritehigh entropylead-freemorphotropic phase boundarypiezoelectric ceramics

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ceramic Engineering

Background:

  • Piezoelectric ceramics are crucial for actuators and transducers.
  • Entropy engineering has improved lead-based materials.
  • Lead-free alternatives are sought for environmental and health reasons.

Purpose of the Study:

  • To apply entropy engineering to bismuth ferrite (BF)-based lead-free systems.
  • To introduce a morphotropic phase boundary (MPB) into BF-based ceramics.
  • To synthesize and characterize novel medium to high entropy lead-free piezoelectric ceramics.

Main Methods:

  • Synthesis of (1-x)BiFeO3-x(Ba0.2Sr0.2Ca0.2Bi0.2Na0.2)TiO3 (BF-xBSCBNT) ceramics with varying x (0.15-0.5).
  • Systematic examination of phase structure, domain configuration, and ferroelectric/piezoelectric properties.
  • Correlation of properties with conformational entropy and MPB presence.

Main Results:

  • Successful synthesis of novel BF-xBSCBNT lead-free piezoelectric ceramics.
  • BF-0.4BSCBNT exhibited a large strain (0.50% at 100 kV/cm), high remanent polarization (∼40.07 μC/cm²), and significant piezoelectric coefficient (∼80 pC/N).
  • Exceptional piezoelectric response (∼500 pm/V) attributed to MPB, coexisting phases, and nanodomains.

Conclusions:

  • Entropy engineering is a viable strategy for developing high-performance lead-free piezoelectric ceramics.
  • The synthesized BF-xBSCBNT system offers a promising lead-free alternative for advanced piezoelectric applications.
  • This research paves the way for next-generation lead-free piezoelectric materials.