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Multiferroic Bi1-xBaxFeO3 (named as BBFO-x, x=0, 0.05, 0.15) are prepared by the sol-gel method through rapid thermal process. The effects of Ba-doping and process conditions on the structures and magnetic properties of the samples are investigated. The experimental results indicate that the process requirements of the pure BBFO-x samples are rigorous. The samples annealed at 800 ℃ for 450 s possess the best structures and magnetic properties. X-ray diffraction results show that Ba-doping causes lattice deformations, but does not change the macroscopic lattice structures of the samples, which is further proved by the Raman spectra of the samples. Besides, Ba-doping is beneficial to enhancing the magnetization of the sample, which is attributed to both the destruction of long-rang antiferromagnetic spiral magnetic structure and the possible spin coupling resulting from the valent state change of the Fe ions. These achievements provide experimental foundation for further studying the microstructure and magnetoelectric coupling effect in such single phase multiferroics.
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Keywords:
- Ba-doped BiFeO3 /
- process conditions /
- structure /
- magnetic properties
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[1] Spaldin N A, Fiebig M 2005 Science 309 391
[2] [3] Fiebig M 2005 J. Phys. D: Appl. Phys. 38 R123
[4] [5] Eerenstein W, Mathur N D, Scott J F 2006 Nature 442 759
[6] [7] Chi Z H, Jin C Q 2007 Prog. Phys. 27 225 (in Chinese) [迟振华, 靳常青 2007 物理学进展 27 225]
[8] Tokunaga Y, KanekoY, Okuyama D, Ishiwata S, Arima T, Wakimoto S, Kakurai K, Taguchi Y, Tokura Y 2011 Phys. Rev. Lett. 105 257201
[9] [10] Duan C G 2009 Prog. Phys. 29 215 (in Chinese) [段纯刚 2009 物理学进展 29 215]
[11] [12] [13] Hu J M, Li Z, Chen L Q, Nan C W 2012 Adv. Mater. 24 2869
[14] Wei J, Chen Y J, Xu Z 2012 Acta Phys. Sin. 61 057502 (in Chinese) [魏杰, 陈彦均, 徐卓 2012 61 057502]
[15] [16] Huang F Z, Wang Z J, Lu X M, Zhang J T, Min K L, Lin W W, Ti R X, Xu T T, He J, Yue C, Zhu J S 2013 Sci. Rep. 3 2907
[17] [18] Yuan X Y, Luo L R, Wu D, Xu Q Y 2013 Chin. Phys. B 22 107702
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[22] Zhou G H, Pan X, Zhu Y X 2013 Acta Phys. Sin. 62 097501 (in Chinese) [周广宏, 潘旋, 朱雨富 2013 62 097501]
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[26] [27] Yang Y, Liu J M, Huang H B, Zou W Q, Bao P, Liu Z G 2004 Phys. Rev. B 70 132101
[28] Choi T, Horibe Y, Yi H T, Choi Y J, Wu W D, Cheong S W 2010 Nat. Mater. 9 253
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[32] Dong S 2010 Physics 39 714 (in Chinese) [董帅 2010 物理 39 714]
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[50] [51] Geck J, Bchner B, Hcker M, Klingeler P, Gross R 2001 Phys. Rev. B 64 144430
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