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Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响*

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宋桂林, 罗艳萍, 苏健, 周晓辉, 常方高*. 2013: Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响*, 物理学报, null(9): 421-429. doi: 10.7498/aps.62.097502
引用本文: 宋桂林, 罗艳萍, 苏健, 周晓辉, 常方高*. 2013: Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响*, 物理学报, null(9): 421-429. doi: 10.7498/aps.62.097502
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2013: Effects of Dy and Co co-substitution on the magnetic properties and TC of BiFeO3 ceramics?, Acta Physica Sinica, null(9): 421-429. doi: 10.7498/aps.62.097502
Citation: 2013: Effects of Dy and Co co-substitution on the magnetic properties and TC of BiFeO3 ceramics?, Acta Physica Sinica, null(9): 421-429. doi: 10.7498/aps.62.097502
shu

Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响*

  • 河南师范大学物理与信息工程学院,新乡 453007

  • 河南省光伏材料重点实验室,新乡 453007

Effects of Dy and Co co-substitution on the magnetic properties and TC of BiFeO3 ceramics?

  • 摘要: 采用快速液相烧结法制备BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3(x=0,0.05,0.1,0.15)陶瓷样品.实验结果表明:所有样品的主衍射峰与纯相BiFeO3相符合且具有良好的晶体结构,随着Co3+掺杂量的增大, Bi0.95Dy0.05Fe1-xCoxO3样品的主衍射峰由双峰(104)与(110)逐渐重叠为单峰(110),当掺杂量x>0.05时,样品呈现正方晶系结构;SEM形貌分析可知: Dy3+, Co3+共掺杂使BiFeO3晶粒尺度由原来的3-5μm减小到约1μm.室温下, BiFeO3样品表现出较弱的铁磁性,随着Dy3+和Co3+掺杂, BiFeO3样品的铁磁性显著提高.在外加磁场为30 kOe的作用下, Bi0.95Dy0.05Fe1-xCoxO3(x=0.05,0.1,0.15)的Mr分别为0.43,0.489,0.973 emu/g;MS分别为0.77,1.65,3.08 emu/g. BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3样品磁矩M 随着温度T 的升高而逐渐减小, Dy掺杂使BiFeO3样品的TN 由644 K升高到648 K,而TC基本没有变化. Dy和Co共掺杂导致BiFeO3样品磁相变温度TC由870 K降低到780 K,其TC变化主要取决于Fe-O-Fe反铁磁超交换作用的强弱和磁结构的相对稳定性.
    Abstract: Multiferroic Bi0.95Dy0.05Fe1-xCoxO3 (x=0, 0.05, 0.1, 0.15) ceramics were prepared by rapid liquid phase sintering method. We studied the effect of (Dy+Co) doping on the structure, electrical and ferromagnetism properties of BiFeO3 ceramics. The structure and morphology of BiFeO3 ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopey (SEM). The results showed that all the peaks for Bi0.95Dy0.05Fe1-xCoxO3 samples can be indexed based on the crystal structure of pure BiFeO3. And XRD analysis revealed a phase transition in (Dy+Co) co-doped BiFeO3 when x was larger than 0.1 and grain sizes changed from 1 to 5 μm. Magnetic hysteresis loops were clearly observed in co-substituted specimens and magnetization was greatly improved. Magnetic measurements showed that all samples possess strong ferromagnetism at room temperature expect BiFeO3 and Bi0.95Dy0.05FeO3, which are weakly ferromagnetic. The M′rs, of Bi0.95Dy0.05Fe1-xCoxO3 with x=0.05, 0.01 and 0.15 are 0.43, 0.489, 0.973 emu/g and the M′rs of them are 0.77, 1.65, 3.08 emu/g, respectively. The magnetic moment of BiFeO3 and B0.95Dy0.05Fe1-xCoxO3 ceramics varies with temperature from 300 to 900 K at an applied field of 5 kOe. It shows that the TN of BiFeO3 from 644 to 648 K with different content of Dy3+can be changed by crystal structures and exchanges between Dy3+-Fe3+. The phase transition temperature of Bi0.95Dy0.05Fe1-xCoxO3 shifted to lower temperatures from 870 K to 780 K demonstrate that Co3+ doping causes a drop of TC as compared with BiFeO3. The change of TC of Bi0.95Dy0.05Fe1-xCoxO3 depends mainly on the Fe-O-Fe super-exchange strength and the relative stability of magnetic structure.
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  • 刊出日期:  2013-05-15

Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响*

  • 河南师范大学物理与信息工程学院,新乡 453007
  • 河南省光伏材料重点实验室,新乡 453007

摘要: 采用快速液相烧结法制备BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3(x=0,0.05,0.1,0.15)陶瓷样品.实验结果表明:所有样品的主衍射峰与纯相BiFeO3相符合且具有良好的晶体结构,随着Co3+掺杂量的增大, Bi0.95Dy0.05Fe1-xCoxO3样品的主衍射峰由双峰(104)与(110)逐渐重叠为单峰(110),当掺杂量x>0.05时,样品呈现正方晶系结构;SEM形貌分析可知: Dy3+, Co3+共掺杂使BiFeO3晶粒尺度由原来的3-5μm减小到约1μm.室温下, BiFeO3样品表现出较弱的铁磁性,随着Dy3+和Co3+掺杂, BiFeO3样品的铁磁性显著提高.在外加磁场为30 kOe的作用下, Bi0.95Dy0.05Fe1-xCoxO3(x=0.05,0.1,0.15)的Mr分别为0.43,0.489,0.973 emu/g;MS分别为0.77,1.65,3.08 emu/g. BiFeO3和Bi0.95Dy0.05Fe1-xCoxO3样品磁矩M 随着温度T 的升高而逐渐减小, Dy掺杂使BiFeO3样品的TN 由644 K升高到648 K,而TC基本没有变化. Dy和Co共掺杂导致BiFeO3样品磁相变温度TC由870 K降低到780 K,其TC变化主要取决于Fe-O-Fe反铁磁超交换作用的强弱和磁结构的相对稳定性.

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