Ba,Ti双位共掺杂BiFeO_3多铁功能陶瓷的制备与性能

Preparation and Properties of Ba and Ti Two-Site co-Doped BiFeO_3 Multiferroic Ceramics

采用快速液相烧结法制备出多铁BiFeO_3(BFO),Bi_1-xBa_xFe_(0.950)Ti_(0.050)O_3(x=0.100,0.150,0.200,0.300,0.350) 和Bi_(0.800)Ba_(0.200)Fe_(1-y)Ti_yO_3(y=0.025,0.050,0.075,0.100)陶瓷.研究了不同Ba,Ti掺杂含量对BFO陶瓷微观结构、表面形貌、介电性能以及磁性的影响.XRD测试表明制得的陶瓷样品为菱形钙钛矿结构,属于R3c空间群,Ba,Ti掺杂含量较高时会引起结构发生畸变.陶瓷的漏电流密度随Ba掺杂含量的升高而增大,却随Ti掺杂含量的升高而减小.磁性测试表明,Ba,Ti双位共掺杂BFO陶瓷具有饱和的磁滞回线,其剩余磁化强度随Ba掺杂含量的增加而增加,但随Ti掺杂含量的增加而减小.在x=0.350时陶瓷样品的最大剩余磁化强度达到0.29emu/g.

Multiferroic ceramics BiFeO_3（BFO）,Bi_1-xBa_xFe_（0.950）Ti_（0.050）O_3（x= 0.100,0.150,0.200,0.300,0.350）and Bi_（0.800）Ba_（0.200）Fe_（1-y）Ti_yO_3（y=0.025,0.500,0.075,0.100）have been prepared by a rapid liquid phase sintering technique,and the effects of Ba and Ti co-doping on the structure,dielectric and the magnetic properties of the BFO are investigated.XRD results show that these ceramics were rhombohedral distorted perovskite structure with space group R3c.With the Ba and Ti doping content increasing,a structure transition from rhombohedral R3c to pseudo-cubic was observed.The ferroelectric measurements revealed that the leakage current increased with the increase of Ba doping content while decreased with the increase of Ti doing content.Room temperature magnetic measurements show that ferromagnetism exists in the co-doped ceramics.The remnant magnetization of the co-doped ceramics improved significantly with the increase of Ba doping content but reduced with the increase of Ti doping content.The highest remnant magnetization obtained in the co-doped BFO ceramics was as high as 0.29emu/g（x=0.350）.