Effectively improved piezoelectricity in high-temperature Arrhenius CBT ceramics by modifying potential energy profile and spontaneous polarization  

作　　者：Jingwen Xi Linlin Liu Hongwei Qiao Jiacheng Luo Xin Su Xin Zhao Yugen Xu Hao Chen Zhi Tan Jianguo Zhu 

机构地区：[1]Nuclear Power Institution of China,Chengdu 610213,China [2]College of Materials Science and Engineering,Sichuan University,Chengdu 610064,China

出　　处：《Journal of Advanced Ceramics》2024年第8期1143-1152,共10页先进陶瓷（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.51932010);the Sichuan Science and Technology Program(No.2023YFG0042).

摘　　要：Enhancing the piezoelectricity of CaBi_(4)Ti_(4)O_(15)(CBT)ceramics is crucial for improving their application potential in high-temperature piezoelectric devices.Here,we propose a strategy involving the introduction of larger Na/Bi ions at the A-site,effectively inhibiting the tilt of oxygen octahedra and flattening the potential energy profile.This flattening enhances the variation in polarization under external fields.Concurrently,substituting Nb/Mn at the B-site increases the deviation between positive and negative ionic centers,leading to stronger spontaneous polarization,while the induced defect dipoles restrict oxygen vacancy migration and increase the direct current resistivity(ρ_(dc)).The flattened potential energy profile and increased spontaneous polarization significantly enhance the overall performance of cBT ceramics,with the piezoelectric constant(d_(33))reaching 25 pC/N when the Curie temperature(Tc)=752℃.Piezoresponse force microscopy(PFM)and transmission electron microscopy(TEM)revealed submicron-long rectangular domains and nanoscale domains in the modified composition,indicating a high density of domain walls.This study presents an effective approach for enhancing the piezoelectric properties of bismuth layered-structured ferroelectrics(BLSFs),thereby improving the application potential of BLSFsathightemperatures.

关 键 词：PIEZOELECTRICITY bismuth layered-structured ferroelectrics(BLSFs) potential energy profile spontaneous polarization high temperatures 

分 类 号：TQ174.75[化学工程—陶瓷工业]