利用高温高压技术制备了Bi0.95La0.05Fe1-xCoxO3(x=0,0.1,0.2)陶瓷样品.研究了La和Co共掺杂对BiFeO3的物相结构及多铁性能的影响.结构分析表明,所有样品均为菱方钙钛矿结构,同时Co掺杂引起一定的结构畸变.Co掺杂导致Bi0.95La0.05FeO3中空间调制的螺旋磁结构转变为共线的G型反铁磁结构,从而导致样品室温磁性能得到明显提高.样品中介电常数随着外加磁场的增加而增加,表明在Co掺杂Bi0.95La0.05FeO3陶瓷中存在磁电耦合效应.在796 kA/m外加磁场及3 kHz频率下,Bi0.95La0.05Fe0.9Co0.1O3和 Bi0.95La0.05Fe0.8Co0.2O3的磁介电系数分别为1.61%和1.75%.
Single-phase Bi0.95La0.05Fe1-xCoxO3 ceramics with x=0, 0.1 and 0.2 were prepared by high pressure synthesis.The effects of La and Co doping on phase structure and multiferroic properties were investigated.X-ray diffraction patterns demonstrated rhombohedral structure for all samples.La and Co co-doping favors weak ferromagnetism ordering with evident magnetic hysteresis loop and enhances magnetization values at room temperature, which is attributed to the change in the spin structure from a cycloidal space modulated spin structure to a collinear G-type antiferromagnetic structure.The dielectric constant for the Co-doped BiFeO3 samples at room temperature increases with increasing applied magnetic fields, which is a signature of the magnetoelectric coupling occurring in the samples.The magnetodielectric coefficient of the Bi0.95La0.05Fe0.9Co0.1O3 and Bi0.95La0.05Fe0.8Co0.2O3 samples reach 1.61% and 1.75% at H=796 kA/m and f=3 kHz, respectively.
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