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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Metal-free perovskites (MFPs) are attractive for their eco-friendly properties and processability.
  • Multiaxial ferroelectrics, with multiple polarization axes, are crucial for improved performance and application versatility.
  • Existing MFPs lack sufficient equivalent polarization axes, limiting their potential.

Purpose of the Study:

  • To design and synthesize novel multiaxial metal-free perovskite ferroelectrics.
  • To achieve the maximum possible number of equivalent polarization axes in MFPs.
  • To demonstrate the piezoelectric sensing capabilities of the designed materials.

Main Methods:

  • Synergistic regulation of anionic geometries (e.g., I⁻, [PF₆]⁻, [ClO₄]⁻, [BF₄]⁻) and cationic asymmetric modification.
  • Synthesis of multiaxial MFP ferroelectrics CMDABCO-NH₄-X₃ (X = [ClO₄]⁻ or [BF₄]⁻).
  • Systemic characterizations to determine crystallographic symmetry and polarization axes.

Main Results:

  • Successfully designed multiaxial MFP ferroelectrics CMDABCO-NH₄-X₃ with the lowest P1 symmetry.
  • Achieved 24 equivalent polarization axes (Aizu notations 432F1 and m3̅mF1), the maximum for ferroelectrics.
  • Demonstrated excellent piezoelectric sensing performance in CMDABCO-NH₄-[ClO₄]₃ polycrystalline samples and composite devices.

Conclusions:

  • A feasible strategy for designing multiaxial MFP ferroelectrics has been established.
  • The developed MFPs exhibit a record number of polarization axes, enhancing their functionality.
  • These materials show significant promise for microelectromechanical, sensing, and body-compatible devices.