摘要
利用高温高压技术制备了Bi_(0.95)La_(0.05)Fe_(1-x)Co_xO_3(x=0,0.1,0.2)陶瓷样品。研究了La和Co共掺杂对BiFeO_3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Bi_(0.95)La_(0.05)FeO_3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Bi_(0.95)La_(0.05)FeO_3陶瓷中存在磁电耦合效应。在796kA/m外加磁场及3kHz频率下,Bi_(0.95)La_(0.05)Fe_(0.9)Co_(0.1)O_3和Bi_(0.95)La_(0.05)Fe_(1-x)Co_xO_3的磁介电系数分别为1.61%和1.75%。
Single-phase Bi_（0.95）La_（0.05）Fe_（1-x）Co_xO_3 ceramics with x=0,0.1and 0.2 were prepared by high pressure synthesis.The effects of La and Co doping on phase structure and multiferroic properties were investigated.Xray 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 Bi_（0.95）La_（0.05）Fe_（0.9）Co_（0.1）O_3 and Bi_（0.95）La_（0.05）Fe_（1-x）Co_xO_3 samples reach 1.61% and 1.75% at H =796kA/m and f=3kHz,respectively.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第6期6069-6073,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51502249)
四川省大学生创新创业计划资助项目(201510619038)
