Gd,Co共掺杂对BiFeO3陶瓷电输运和铁磁特性的影响

宋桂林; 周晓辉; 苏健; 杨海刚; 王天兴; 常方高

doi:10.7498/aps.61.177501

摘要

采用快速液相烧结法制备BiFeO3和Bi0.95Gd0.05Fe1-xCoxO3 (x= 0, 0.05, 0.1, 0.15, 0.2)陶瓷样品,研究Gd, Co共掺杂对BiFeO3微观结构, 介电性能和铁磁性的影响. X射线衍射谱表明: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x的增大, Bi0.95Gd0.05Fe1-xCoxO3样品的主衍射峰(104)与(110)逐渐相互重叠, 当x大于0.1时, 样品呈现正方晶系结构; J-V特性显示Gd3+, Co3+共掺杂有效地降低BiFeO3陶瓷的漏导电流,其降低幅度为1-2个数量级; 当f=103 Hz时, Bi0.95Gd0.05Fe0.8Co0.2O3的介电常数是BiFeO3的6倍, 而Bi0.95Gd0.05Fe0.95Co0.05O3和 Bi0.95Gd0.05Fe0.85Co0.15O3样品的介电损耗最小,均为0.01.室温下, Bi0.95Gd0.05Fe1-xCoxO3样品磁性与BiFeO3相比显著增强. 在磁场为30 kOe的作用下,Bi0.95Gd0.05Fe1-xCoxO3 (x= 0, 0.05, 0.1, 0.15, 0.2)的剩余磁化强度Mr分别是BiFeO3的34, 60, 105, 103, 180倍.样品磁性增强的主要原因是Gd, Co掺杂使BiFeO3的晶格结构发生变化导致BiFeO3自身储存的磁性能被释放, Gd3+的4f电子与Fe3+或Co3+的3d电子自旋相互作用及样品中存在局域的 Fe-O-Co磁耦合三者共同作用的结果.

关键词:

Abstract

Multiferroic Bi0.95Gd0.05Fe1-xCoxO3 (x= 0, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by rapid liquid phase sintering method. We studied effect of Gd and Co doping on the structure, electrical and ferromagnetism properties of BiFeO3 ceramics. The structure and morphology of BiFeO3 ceramics are characterized by X-ray diffraction (XRD). The results show that all the peaks for Bi0.95Gd0.05Fe1-xCoxO3 (x= 0, 0.05, 0.1, 0.15, 0.2) samples can be indexed according to the crystal structure of pure BiFeO3. And X-ray diffraction analysis reveals a phase transition in Gd-Co codoped BiFeO3 ceramics when x is larger than 0.1.The current densities of all samples measured at room temperature are approximately three orders of magnitude lower than that of BFO ceramic, and the leakage current of the ceramics at room temperature exhibits two distinctive conduction behaviors: Ohmic conduction and space charge limited (SCL) conduction mechanism.For all the samples studied here, the dielectric constant and dielectric loss decrease with the increase of frequency in a range from 1 kHz to 1 MHz. The dielectric constants of Bi0.95Gd0.05Fe1-xCoxO3 (x= 0, 0.05, 0.1, 0.15,0.2) samples are nearly 1.9, 2.68, 3.85, 5.3, and 6 times larger than that of pure BiFeO3 (εr= 61.2) ceramic at 1 kHz, respectively. And the dielectric losses of Bi0.95Gd0.05Fe1-xCoxO3 samples become smaller than that of BFO ceramic.The magnetic measurements show that all the samples possess strong ferromagnetism at room temperature expect BiFeO3 and Bi0.95Gd0.05FeO3 which are weakly ferromagnetic. Under an external magnetic field of 30 kOe, the values of Mr of Bi0.95Gd0.05Fe1-xCoxO3 are 34, 60, 105, 103 and 180 times that of BiFeO3, respectively.

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: 国家自然科学基金(批准号: 60571063); 河南省重点科技攻关项目(批准号: 122102210191); 河南省教育厅自然科学研究计划(批准号: 2011A140014)和河南师范大学青年基金(批准号: 2010qk02)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 Photovoltaic Materials, Xinxiang 453007, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 60571063), the Key Scientific and Technological Research Projects in Henan Province (Grant No. 122102210191), the Basic Research Program of Education Bureau of Henan Province, China (Grant No. 2011A140014), and the Scientific Research Foundation for Youth of Henan Normal University (Grant No. 2010qk02).

参考文献

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施引文献

[1]	Nelson C T, Gao P, Jokisaari J R, Adamo C, Folkman C M, Eom C B, Schlom D G, Pan X Q 2011 Science 334 968
[2]	Kuibo Y, Mi L, Liu Y W, He C L, Zhu G F, Chen B, Lu W, Pan X Q, Li W R 2010 Appl. Phys. Lett. 97 0421012010
[3]	Choi T, Lee S, Choi Y J, Kiryukhin V, Cheong S W 2009 Science 342(3) 63
[4]	Yang S Y, Martin L W, Byrnes S J, Conry T E, Basu S R, Paran D, Reichertz L, Ihlefeld J, Adamo C, Melville A, Chu Y H, Schlom D G, Ager J W, Ramesh R 2009 Appl. Phys. Lett. 95 062909
[5]	Yang H, Wang Y Q, Wang, Jia Q X 2010 Appl. Phys. Lett. 96 012909
[6]	Gary W P, Lane W M, Ying H C 2007 Appl. Phys. Lett. 90 072902
[7]	Freer R, Thrall M, Cernik R, Tuna F, Collison D 2010 J. Eur. Ceram. Soc. 30 727
[8]	Kawae T, Tsuda H, Morimoto A 2008 Appl. Phys. Express 1 051601
[9]	Wen Z, Shen X, Wu J X, Wu D Li A D, Yang B, Wang Z, Chen H Z, Wang J L 2010 Appl. Phys. Lett. 96 202904
[10]	Poonam U, Yadav K L 2008 Mat. Lett. 62 2858
[11]	Sen K, Thakur Sange, Singh K, Gautam A, Singh M 2011 Mat. Lett. 65 1963
[12]	Lee S U, Kim S S, Park M H, Kim J W, Jo H K, Kim W J 2007 Appl. Surf. Sci. 5(254) 1493
[13]	Won S K, Youn K J, Kee H K, Hong S H 2009 J. Mag. Mag. Mat. 321 3262
[14]	Yang K G, Zhang Y L, Yang S H, Wang B 2010 J. Appl. Phys. 107 124109
[15]	Zheng X H, Xu Q G, Wen Z, Lang X Z, Wu D, Qiu T, Xu M X 2010 J. Allo. Comp. 499 108
[16]	Puli V S, Kumar A, Panwar N, Panwar C, Katiyar R S 2011 J. Allo. Comp. 509 8223
[17]	Wang Y P, Zhou L, Zhang M F, Chen X Y, Liu J M, Liu Z G 2004 Appl. Phys. Lett. 84 1731
[18]	Kim W S, Jun Y K, Kim K H, Hong S H 2009 J. Mag. Mag. Mat. 321 3262
[19]	Kawae T, Terauchi Y, Tsuda H, Kumeda M, Morimoto A 2009 Appl. Phys. Lett. 94 112904
[20]	Chang F G, Song G L, Fang K, Wang Z K 2007 Acta. Phys. Sin. 56 6068 (in Chinese) [常方高, 宋桂林, 房坤, 王照奎 2007 56 6068]
[21]	Chin F C, Jen P L, Jenn M W 2006 Appl. Phys. Lett. 88 242909
[22]	Jun Y K, Hong S H 2007 Solid State Commun. 144 329
[23]	Du Y, Cheng Z X, Dou S X, Wang X L 2010 Thin Solid Films 518(24) 5
[24]	Huang J Z, Wang Y, Lin Y H, Li M, Nan C W 2009 J. Appl. Phys. 106 063911

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