Dy, Co共掺杂对BiFeO3陶瓷磁特性和磁相变温度Tc的影响

宋桂林; 罗艳萍; 苏健; 周晓辉; 常方高

doi:10.7498/aps.62.097502

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—5 μ减小到约1 μ. 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.

关键词:

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.

Keywords:

作者及机构信息

1.
河南师范大学物理与信息工程学院, 新乡 453007;

2.
河南省光伏材料重点实验室, 新乡 453007

基金项目: 河南省重点科技攻关项目(批准号:122102210191)、河南省基础与前沿技术研究计划项目(批准号:122300410231,122300410203)和河南省教育厅自然科学研究计划(2011A140014)资助的课题.

Authors and contacts

1.
College of Physics & Information Engineering, Henan Normal University, Xinxiang 453007, China;

2.
Henan Key laboratory of photovoltail Materials, Xinxiang 453007, China

Funds: Project supported by the Henan Provincial key Scientific and Technological Research Projects (Grant No: 122102210191), the Basic Research Projects in Henan Province, China (Grant Nos. 122300410231, 122300410203), the Basic Research Program of Education Bureau of Henan Province, China (Grant No. 2011A026).

参考文献

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施引文献

[1]	Choi T, Lee S, Choi Y J, Kiryukhin V, Cheong S W 2009 Science 342 63
[2]	Yang H, Wang Y Q 2010 Appl. Phys. Lett. 96 012909
[3]	Nelson C T, Gao P, Jokisaari J R, Adamo C, Folkman C M, Eom C B, Schlom D G, Pan X Q S 2011 Science 334 968
[4]	Neaton J B, Ederer C, Waghaaren U V 2005 Phys. Rev. B 71 014113
[5]	Zhang H, Liu Y J, Pan L H, Zhang Y 2009 Acta. Phys. Sin. 58 7141 (in Chinese) [张晖, 刘拥军, 潘丽华, 张瑜 2009 58 71412]
[6]	Kornev Igor A, Lisenkov S, Haumont R, Dkhil B, Bellaiche1 L 2007 Phys. Rev. Lett. 99 227602
[7]	Naganum H, Shimura N, Miura J, Shima H, Yasui S, Okamur S 2008 J. Appl. Phys. 103 072314
[8]	Jun Y K, Hong S H 2007 Solid. State. Commun. 144 329
[9]	Chang F G, Zhang N, Song G L 2007 J. Phys. D: Appl. Phys. 40 7799
[10]	Choi E M, Patnaik S, Weal E, Sahonta S L, Wang H, Macmanus J L 2011 Appl. Phys. Lett. 98 012509
[11]	Nalwa K S, Garg A, Upadhyay A 2008 Mater. Lett. 62 878
[12]	Du Y, Cheng Z X, Shahbazi M, Edward W C, Dou S X, Wang X L 2010 J. Allo. Comp. 490 637
[13]	Khomchenko V A, Shvartsman V V, Borisov P, Kleemann W, Kiselev D A, Bdikin I K, Vieira J M, Kholkin A L 2009 Acta. Mater 57 5137
[14]	Palkar V R, Prashanthi K, Mandal M 2010 Mater. Lett. 64 1455.
[15]	Liu S, Li J, Pan W Lattice 2009 Rare mateal materials and engineering 38 653
[16]	Yang K G, Zhang Y L, Yang S H, Wang B 2010 J. Appl. Phys. 107 124109
[17]	Qian F Z, Jiang J S, Jiang D M, Wang C M, Zhang W G 2010 J. Magn. Magn. Mat. 322 3127
[18]	Zheng X H, Xu Q G, Wen Z, Lang X Z, Wu D, Qiu T, Xu M X 2010 J. Allo. Comp. 499 108
[19]	Kumar A, Yadav K L, Yoti R J 2012 Macromol. Chem. Phys. 134 430
[20]	Yang C, Liu C Z, Wang C M, Zhang W G, Jiang J S 2012 J. Magn. Magn. Mat. 324 1483
[21]	Song G L, Zhang H X, Wang T X, Yang H G, Chang F G 2012 J. Magn. Magn. Mat. 324 2121
[22]	Mao WW, Li X A, Li Y T, Li P, Bao G, Yang T, Yang J P 2012 Mater. Lett. 76 135
[23]	Song G L, Zhou X H, Su J, Yang H G, Wang T X, Chang F G 2012 Acta. Phys. Sin. 61 177501 (in Chinese) [宋桂林, 周晓辉, 苏健, 杨海刚, 王天兴, 常方高 2012 61 177501]
[24]	Kumar A, Yadav K L, Rani J Y 2012 Macromol. Chem. Phys. 134 430
[25]	Cai M Q, Liu J C, Yang G W, Cao Y L, Tan X, Yi X, Wang Y G, Wang L L, Hu W Y 2007 J. Chem. Phys. 126 154708
[26]	Hu X, Wang W, Miao X Y, Cheng X B 2010 Acta. Phys. Sin. 59 8160 (in Chinese) [胡星, 王伟, 毛翔宇, 陈小兵 2010 59 8160]
[27]	Zhang X Q, Yu S, Wang X J, Mao J H, Zhu R B, Wang Y, Wang Z, Liu Y Q 2011 J. Allo. Comp. 509 5908
[28]	Cheng Z X, Wang X L, Du Y, Dou S X 2010 J. Phys. D: Appl. Phys. 43 242001
[29]	Das R, Mandal K 2012 J. Magn. Magn. Mat. 324 1913
[30]	Naik V B, Mahendiran R 2009 Solid. State. Commun. 149 754
[31]	Li L Y, Yi J X, Ge Y C, Peng Y D 2008 The Chinese Journal of Nonferrous Metals 18 72 (in Chinese) [李丽娅, 易健宏, 葛毅成, 彭元东 2008 中国有色金属学报 18 72]
[32]	Franse J M, Boer F R, Frings P H, Gersdorf R, Menovsky A, Muller F A, Radwanski R J, Sinnema S 1985 Phys. Rev. B 31 4346
[33]	Belorizky E, Fremy M A, Govigan J P 1987 J. Appl. Phys. 61 3971

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