Aliovalent co-doping induces relaxor states with enhanced electrostrain in BNT-based ceramicsOA
Developing high-performance lead-free electrostrain materials is key to advancing next-generation electromechanical technologies.Here we report an aliovalent co-doping strategy in(Bi_(0.5)Na_(0.5))TiO_(3)-based(BNT-based)ceramics,where simultaneous A-site(Li^(+))and B-site(Nb^(5+))co-doping yields(1−x)Bi_(0.5)(Na_(0.81)K_(0.19))0.5TiO_(3)-xLiNbO_(3)(BNKT-xLN,x=0.01-0.04)compositions.The aliovalent substitution disrupts long-range ferroelectric order,enhances lattice distortion,and promotes a relaxor-like state with diffuse phase transitions and strong dielectric dispersion.Complementary polarization-electric field(P-E)and strain-electric field(S-E)measurements demonstrate a progressive evolution from classical ferroelectrisc to nonergodic relaxor behavior as the doping level increases.The optimized composition at x=0.02 exhibits a large reversible electrostrain of approximately 0.55% associated with a temperature-driven reversible phase transition.Notably,BNKT-xLN ceramics achieve electric-field-induced polarizations exceeding 50μC/cm^(2),while exhibiting a relatively low electrostrictive coefficient Q33 of∼0.018 m^(4)/C^(2),suggesting their potential as energy storage matrices due to the weak polarization-strain coupling effect.These results underscore the importance of aliovalent co-doping strategy in modulating the energy landscape of BNT-based systems,offering a viable strategy for developing high-strain,lead-free electroceramics suited to next-generation actuators and energy storage devices.
Amei Zhang;Wanchang Man;Ruiyi Jing;Hongping Hou;Yule Yang;Leiyang Zhang;Hongliang Du;Li Jin
Multifunctional Electronic Ceramics Laboratory,College of Engineering,Xi''an International University,Xi''an,710077,ChinaElectronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Xi''an Jiaotong University,Xi''an,710049,ChinaElectronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Xi''an Jiaotong University,Xi''an,710049,ChinaMultifunctional Electronic Ceramics Laboratory,College of Engineering,Xi''an International University,Xi''an,710077,ChinaElectronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Xi''an Jiaotong University,Xi''an,710049,ChinaElectronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Xi''an Jiaotong University,Xi''an,710049,ChinaMultifunctional Electronic Ceramics Laboratory,College of Engineering,Xi''an International University,Xi''an,710077,ChinaElectronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Xi''an Jiaotong University,Xi''an,710049,China
化学化工
BNTLead-free ferroelectricsElectrostrainRelaxor behaviorAliovalent co-doping
《Journal of Materiomics》 2026 (1)
P.136-147,12
supported by the National Natural Science Foundation of China(Grant Nos.52302153 and 52402155)the China Postdoctoral Science Foundation(Grant Nos.GZC20232075 and 2023M742767)the Youth Innovation Team of Shaanxi Universities,and the Scientific Research Program Funded by Shaanxi Provincial Education Department,China(Grant No.22JP073)。
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