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Boosting capacitive energy storage in relaxor ferroelectrics through polymorphic phase engineering.

Yang Zhang1,2, Huan Liang1, Yajing Liu1

  • 1College of Physics, MIIT Key Laboratory of Aerospace Information Materials and Physics, State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.

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This summary is machine-generated.

Polymorphic phase engineering in relaxor ferroelectrics boosts capacitor energy storage. Rhombohedral/tetragonal phase mixtures offer superior performance due to lower switching barriers and local inhomogeneity.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Relaxor ferroelectric materials are key for advanced capacitors due to high energy storage.
  • Polymorphic phase engineering enhances relaxor ferroelectric performance, but underlying mechanisms are unclear.

Purpose of the Study:

  • To investigate the impact of phase coexistence on energy storage in relaxor ferroelectrics.
  • To elucidate the mechanisms behind enhanced capacitive performance in mixed-phase systems.

Main Methods:

  • Phase-field simulations were used to model dendrite-like PbZr1-xTixO3/MgO nanocomposites.
  • Systematic examination of rhombohedral-dominant, mixed rhombohedral/tetragonal, and tetragonal-dominant phases.

Main Results:

  • Rhombohedral/tetragonal phase mixtures exhibited superior capacitive energy storage.
  • Low switching barriers and significant local inhomogeneity were identified as key contributing factors.

Conclusions:

  • Mixed-phase relaxor ferroelectrics provide enhanced energy storage capabilities.
  • Findings offer theoretical guidance for designing high-performance capacitors through phase engineering.