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Multiferroic BiFe1-xMnxO3 (x= 0, 0.05, 0.10, 0.15, 0.20) (represented as BF1-xMxO) ceramics are prepared by the conventional solid state reaction technique. The effects of Mn4+ doping on density, phase structure, morphology, dielectric and ferroelectric properties are investigated. The X-ray diffraction patterns of the samples indicate that the typical perovskite phase structure of BiFeO3 is formed, and a phase transition starts near x= 0.05, i.e., the phase structure is distorted from rhombohedral to orthorhombic by Mn4+ doping. The dielectric susceptibility of the sample is significantly increased and the dielectric loss is slightly increased with the increase of Mn4+ content. The dielectric constant r of the BiFe0.85Mn0.15O3 ceramic at 10 kHz is as high as 1065, 22 times larger than that for pure BiFeO3. It is suggested by hysteresis loop measurements that the ferroelectric property of the BF1-xMxO ceramics is improved and the remanent polarization is increased by Mn4+ doping. This is probably because Mn4+ is more stable than Fe3+, and the B-site doping with higher valent Mn4+ could reduce the volatilization of Bi3+ and suppress the valence fluctuation of Fe3+, thereby reducing the concentration of oxygen vacancies and the leakage current in the ceramic.
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Keywords:
- Mn4+ doping /
- BiFe1-xMnxO3 ceramics /
- microstructure /
- electrical properties
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[1] Spaldin N A, Fiebig M 2005 Science 309 391
[2] Eerenstein W, Mathur N D, Scott J F 2006 Nature 442 759
[3] Ramesh R, Spaldin N A 2007 Nat. Mater. 6 21
[4] Nan C W, Bichurin M I, Dong S, Viehland D, Srinivasan G 2008 J. Appl. Phys. 103 031101
[5] Wang K F, Liu J M, Ren Z F 2009 Adv. Phys. 58 321
[6] Catalan G, Scott J F 2009 Adv. Mater. 21 2463
[7] Wang J, Neaton J B, Zheng H 2003 Science 299 1719
[8] Zhang H, Liu Y J, Pan L H 2009 Acta Phys. Sin. 58 7141 (in Chinese) [张晖, 刘拥军, 潘丽华 2009 58 7141]
[9] Zhang S T, Zhang Y, Lu M H 2006 Appl. Phys. Lett. 88 162901
[10] Hong X, Wang W, Mao X Y 2010 Acta Phys. Sin. 59 8160 (in Chinese) [胡星, 王伟, 毛翔宇 2010 59 8160]
[11] Neaton J B, Yadav K L, Ederer C 2005 Phys. Rev. B 71 1
[12] Nalwa K S, Garg A, Upadhyaya A 2008 Mater. Lett. 62 2858
[13] Wang D H, Goh W C, Ning M 2006 Appl. Phys. Lett. 88 212907
[14] Wang L Y, Wang D H, Huang H B 2009 J. Alloys. Compd. 469 1
[15] Liu G, Guo H L, Zhang Q 2010 J. Funct. Mater. 6 1053 (in Chinese) [刘果, 郭红力, 张强 2010 功能材料 6 1053]
[16] Srinivas A, Boey F 2004 Ceram. Int. 30 1427
[17] Lou Y H, Song G L, Chang F G, Wang Z K 2010 Chin. Phys. B 19 077702
[18] Chang F G, Song G L, Wang Z K 2007 Acta Phys. Sin. 56 6068 (in Chinese) [常方高, 宋桂林, 王照奎 2007 56 6068]
[19] Wang Y P, Zhou L, Zhang M F 2004 Appl. Phys. Lett. 84 1731
[20] Luo B C, Zhou C C, Chen C L 2009 Acta Phys. Sin. 58 4563 (in Chinese) [罗炳成, 周超超, 陈长乐 2009 58 4563]
[21] Yuan G L, Liu J M 2006 Appl. Phys. Lett. 88 062905
[22] Li J B, Guang H, Xiao Y G 2010 Chin. Phys. B 19 10
[23] Buette B, Zvyagin S, Pyatakov A P 2004 Phys. Rev. B 69 064114
[24] Yuan G L, Wang Y P 2007 J. Appl. Phys. 101 064101
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