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Giant Electrostrain in Lead-Free BiFeO3-BaTiO3 Ceramics via High-Entropy Design.

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Summary

A novel high-entropy strategy enhances piezoelectric materials for advanced actuators. This approach induces lattice distortions, significantly boosting electromechanical response and achieving a giant electrostrain of 1.23%.

Keywords:
chemical disordergiant electrostrainhigh-entropy strategylead-free piezoceramicsmorphotropic phase boundary

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ferroelectricity

Background:

  • Piezoelectric actuators convert electrical energy to mechanical strain, crucial for electromechanical devices.
  • The morphotropic phase boundary (MPB) approach is standard for enhancing piezoelectric performance.
  • Exploring alternatives to the MPB method is essential for advancing piezoelectric materials.

Purpose of the Study:

  • To investigate a high-entropy strategy for enhancing the electromechanical response of ferroelectric materials.
  • To explore the effects of chemical disorder and lattice distortions on piezoelectric properties.
  • To develop high-performance piezoelectric actuators beyond conventional MPB designs.

Main Methods:

  • Utilized a high-entropy strategy in the BiFeO3-BaTiO3 (BF-BT) system.
  • Introduced chemical disorders and lattice distortions via high-entropy incorporation.
  • Analyzed the formation of nanopolar regions and nanodomain structures.

Main Results:

  • Achieved an ultrahigh electromechanical response in high-entropy BF-BT ceramics.
  • Demonstrated a giant unipolar electrostrain of 1.23% at 80 kV cm⁻¹.
  • Obtained fatigue-free performance and a high converse piezoelectric coefficient (d33*) of 1537 pm V⁻¹.

Conclusions:

  • High-entropy design is a promising strategy for developing superior ferroelectric materials.
  • The induced atomic disorders and lattice distortions significantly enhance piezoelectric properties.
  • This research paves the way for high-performance piezoelectric actuators with improved durability and efficiency.