Rare-earth elements are the promising candidates to improve the multiferroic properties of BiFeO_(3)ceramics.Herein,two groups double rare-earth(La_(0.5)Sm_(0.5)and Gd_(0.5)Sm_(0.5))-modified BiFeO_(3)were synthesized...Rare-earth elements are the promising candidates to improve the multiferroic properties of BiFeO_(3)ceramics.Herein,two groups double rare-earth(La_(0.5)Sm_(0.5)and Gd_(0.5)Sm_(0.5))-modified BiFeO_(3)were synthesized via a solid-state reaction sintering process.The influence of the ionic radius of rare-earth elements on the structure and multiferroic properties was systematically investigated.Structural analysis revealed that the smaller ionic radius accelerated the phase transition process(i.e.,R3c-Pna2_(1)-Pbnm)in BiFeO_(3).An increase in rare-earth content resulted in a linear decrease in the Curie temperature,and compositions doped with Gd_(0.5)Sm_(0.5),which have a smaller ionic radius,experienced a more rapid decline.The substitution of rare-earth elements led to an increase in the coercive field(E_(c)),and the Gd_(0.5)Sm_(0.5) system exhibited a larger Ec.Furthermore,all samples demonstrated improved ferroelectric properties compared to pure BiFeO_(3),with remanent polarization values exceeding 30μC cm^(-2),and reaching up to 40μC cm^(-2)in the La_(0.5)Sm_(0.5)-substituted sample.Magnetic measurements showed that the Gd_(0.5)Sm_(0.5) co-doped composition yielded a more substantial enhancement in magnetization,reaching a maximum remanent magnetization(M_(r))of 71.6 emu mol-1.Additionally,the M_(r) decreased following direct current electric field poling conduction,indicating the presence of electric-field-controlled magnetization.These findings underscore the critical role of rare-earth element ionic radius in modifying the multiferroic properties of BiFeO_(3)-based ceramics.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2022YFB3807602)the National Natural Science Foundation of China(No.51802003)+1 种基金the Natural Science Foundation of Anhui Provincial Education Department(No.KJ2021A0362)Zhejiang Provincial Natural Science Foundation of China(No.LGG22E020006)
文摘Rare-earth elements are the promising candidates to improve the multiferroic properties of BiFeO_(3)ceramics.Herein,two groups double rare-earth(La_(0.5)Sm_(0.5)and Gd_(0.5)Sm_(0.5))-modified BiFeO_(3)were synthesized via a solid-state reaction sintering process.The influence of the ionic radius of rare-earth elements on the structure and multiferroic properties was systematically investigated.Structural analysis revealed that the smaller ionic radius accelerated the phase transition process(i.e.,R3c-Pna2_(1)-Pbnm)in BiFeO_(3).An increase in rare-earth content resulted in a linear decrease in the Curie temperature,and compositions doped with Gd_(0.5)Sm_(0.5),which have a smaller ionic radius,experienced a more rapid decline.The substitution of rare-earth elements led to an increase in the coercive field(E_(c)),and the Gd_(0.5)Sm_(0.5) system exhibited a larger Ec.Furthermore,all samples demonstrated improved ferroelectric properties compared to pure BiFeO_(3),with remanent polarization values exceeding 30μC cm^(-2),and reaching up to 40μC cm^(-2)in the La_(0.5)Sm_(0.5)-substituted sample.Magnetic measurements showed that the Gd_(0.5)Sm_(0.5) co-doped composition yielded a more substantial enhancement in magnetization,reaching a maximum remanent magnetization(M_(r))of 71.6 emu mol-1.Additionally,the M_(r) decreased following direct current electric field poling conduction,indicating the presence of electric-field-controlled magnetization.These findings underscore the critical role of rare-earth element ionic radius in modifying the multiferroic properties of BiFeO_(3)-based ceramics.
