Acceptor doping and actuation mechanisms in Sr-doped BiFeO_(3)-BaTiO_(3)ceramics  

作　　者：Ziqi Yang Yizhe Li Bing Wang Juncheng Pan Annette K.Kleppe David A.Hall 

机构地区：[1]Department of Materials,University of Manchester,M139PL,Manchester,UK [2]Diamond Light Source Ltd.,Harwell Science and Innovation Campus,OX110DE,Didcot,UK

出　　处：《Journal of Materiomics》2024年第1期57-69,共13页无机材料学学报（英文）

基　　金：Yizhe Li and David Hall acknowledge financial support by the Engineering and Physical Sciences Research Council(Grant number EP/S028978/1).

摘　　要：BiFeO_(3)-BaTiO_(3)(BF-BT)ceramics are important multiferroic materials,which are attracting significant attention for potential applications in high temperature lead-free piezoelectric transducers.In the present study,the effects of Sr^(2+)as an acceptor dopant for Bi^(3+),in the range from 0 to 1.0%(in mole),on the structure and ferroelectric/piezoelectric properties of 0.7BiFeO_(3)-0.3BaTiO_(3)ceramics were evaluated.The use of a post-sintering Ar annealing process was found to be an effective approach to reduce electrical conductivity induced by the presence of electron holes associated with reoxidation during cooling.A low Sr dopant concentration(0.3%,in mole)yielded enhanced ferroelectric(P_(max)∼0.37 C/m^(2),P_(r)∼0.30 C/m^(2))and piezoelectric(d_(33)∼178 pC/N,k_(p)∼0.27)properties,whereas higher levels led to chemically heterogeneous core-shell structures and secondary phases with an associated decline in performance.The electric field-induced strain of the Sr-doped BF-BT ceramics was investigated using a combination of digital image correlation macroscopic strain measurements and in-situ synchrotron X-ray diffraction.Quantification of the intrinsic(lattice strain)and extrinsic(domain switching)contributions to the electric field induced strain indicated that the intrinsic contribution dominated during the poling process.

关 键 词：Bismuth ferrite-barium titanate Acceptor doping ELECTROCERAMICS PIEZOELECTRICITY In-situ X-ray diffraction 

分 类 号：TQ174.1[化学工程—陶瓷工业]