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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
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.
None:
Relaxor ferroelectric materials are promising for next-generation capacitors due to their high energy storage capacity. Polymorphic phase engineering, where different ferroelectric phases coexist, has been widely demonstrated as an effective approach to further boost capacitive energy storage performance of relaxor ferroelectrics, but the reasons for these improvements and how they compare to single-phase systems remain unclear. Here, taking dendrite-like PbZr1-xTixO3/MgO nanocomposites with defected as a model system, we systematically examine properties and capacitive energy storage performance for rhombohedral-dominant, rhombohedral/tetragonal-mixed, and tetragonal-dominant phases through phase-field simulations. We find that the rhombohedral/tetragonal mixtures deliver the best results in most cases, mainly due to their low switching barriers and substantial local inhomogeneity. These results offer a detailed view of improved energy storage in relaxor ferroelectrics and provide theoretical guidance for designing high-performance capacitors.
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