Y-Co共掺BiFeO_3粉体的结构和多铁性研究

Structural and multiferroic properties of (Y,Co) co-doped BiFeO_3 nanoparticles

采用溶胶-凝胶工艺制备了纯BiFeO_3(BFO)、A位钇掺杂Bi_(0.95)Y_(0.05)FeO_3(BYFO)、B位钴掺杂BiFe_(0.95)Co_(0.05)O_3(BFCO)、以及A和B位钇钴共掺杂Bi_(0.95)Y_(0.05)Fe_(0.95)Co_(0.05)O_3(BYFCO)纳米粒子,并对样品的结构和形貌以及多铁性能进行了系统的研究。结果表明不论是A位掺杂,还是B位掺杂,对BFO的铁电和铁磁性能都有很大的提高,而A和B位钇钴共掺取得了最好的铁电和铁磁性能。与纯BFO样本相比,BYFCO样本的漏电流密度降低两个数量级,而剩磁(Mr)达到0.085 emu/g。Y-Co共掺杂BYFCO纳米粒子被证明是一种提高BFO多铁性能的有效方法。

The pure BiFeO3（ BFO）,A-site Y single-doped Bi（0. 95 ）Y（0. 05）FeO3（ BYFO）,B-site Co singledoped BiFe（0.95）Co（0.05）O3（ BFCO） and A/B-site（ Y,Co） co-doped Bi（0.95）Y（0.05）Fe（0.95）Co（0.05）O3（ BYFCO） nanoparticles are prepared by a sol-gel method. The crystal structure and multiferroic properties of the samples are systematically investigated. Results show that all the A/B-site single-doped and co-doped BFO samples can improve ferroelectric and ferromagnetic properties,A/B-site co-doped BYFCO sample can achieved the best ferroelectric and ferromagnetic properties. Compared with the pure BFO sample,the leakage current density of the BYFCO sample decreases about two orders of magnitude. The remanent magnetization（ Mr） of the BYFCO sample reaches 0. 085 emu/g. The（ Y,Co） co-doped BFO nanoparticles has been proved to be an effective method for improving the multiferroic properties.