Energy storage optimization of ferroelectric ceramics during phase-transition process of amorphous/nanocrystalline and polycrystalline by using a phaseffeld model for dielectric breakdown  

作　　者：Suilong Huang Jianwen Chen Zhen Su Xiucai Wang Wenbo Zhu Wenjun Chen Xinmei Yu Peng Xiao 

机构地区：[1]School of Electronic and Information Engineering,Foshan University Foshan 528000,P.R.China [2]School of Mechatronic Engineering and Automation,Foshan University Foshan 528000,P.R.China [3]China-Australia Institute for Advanced Materials and Manufacturing,Jiaxing University Jiaxing 314001,P.R.China [4]School of Materials Science and Hydrogen Energy,Foshan University Foshan 528000,P.R.China [5]School of Physics and Optoelectronic Engineering,Foshan University Foshan 528000,P.R.China

出　　处：《Journal of Advanced Dielectrics》2024年第1期33-41,共9页先进电介质学报（英文）

基　　金：supported by the youth project of Guangdong Foshan joint fund of Guangdong Natural Science Foundation(Grant No.2020A1515110601 and Grant No.2019A1515110444);the National Natural Science Foundation of China(No:61804029);the Project of Foshan Science and Technology Innovation Team(No:FS0AA-KJ919-4402-0062).

摘　　要：Ferroelectric ceramics have the potential to be widely applied in the modern industry and military power systems due to their ultrafast charging/discharging speed and high energy density.Considering the structural design and electrical properties of ferroelectric capacitor,it is still a challenge to ffnd out the optimal energy storage of ferroelectric ceramics during the phase-transition process of amorphous/nanocrystalline and polycrystalline.In this work,a ffnite element model suitable for the multiphase ceramic system is constructed based on the phase ffeld breakdown theory.The nonlinear coupling relationship of multiple physical ffelds between multiphase ceramics was taken into account in this model.The basic structures of multiphase ceramics are generated by using the Voronoi diagram construction method.The speciffed structure of multiphase ceramics in the phase-transition process of amorphous/nanocrystalline and polycrystalline was further obtained through the grain boundary diffusion equation.The simulation results show that the multiphase ceramics have an optimal energy storage in the process of amorphous polycrystalline transformation,and the energy storage density reaches the maximum when the crystallinity is 13.96%and the volume fraction of grain is 2.08%.It provides a research plan and idea for revealing the correlation between microstructure and breakdown characteristics of multiphase ceramics.This simulation model realizes the nonlinear coupling of the multiphase ceramic mesoscopic structure and the phase ffeld breakdown.It provides a reference scheme for the structural design and performance optimization of ferroelectric ceramics.

关 键 词：Ferroelectric ceramics phase transition phase-field model dielectric breakdown energy storage 

分 类 号：TQ174.7[化学工程—陶瓷工业]