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Multiferroic ceramics of Bi5Fe1-xCo x Ti3O15(x=0.0—0.6) are synthesized by the conventional solid state reaction, and their microstructure,magnetic and ferroelectric properties are investigated. X-ray diffraction patterns show that a four-layer Aurivillius phase is formed in each sample with a suggested structural transformation at heavy doping of Co ions. The Raman results demonstrate that Co ions enter into the lattice,occupy the B-sites in the BFCT-x and have an effect on the order occupancy of cations at B sites. It is found that the Co ion modification induces remarkable ferromagnetism (FM) at room temperature with a greatest remanent magnetization (2M r) of 2.3 memu/g at x=0.5,which is three orders of magnitude larger than that of Bi5Ti3FeO15(BFTO). All samples with Co doping have ferroelectricity (EM). The remanent polarization (2P r) reaches a value of 11 μC/cm2 at x=0.1,which is about 38.2% higher than that of BFTO,and then decreases when 0.2≤x≤0.4 and increases again at x=0.5 and 0.6. Of all materials,the sample of x=0.5 is best in both good FE and FM.
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Keywords:
- solid state reaction /
- multiferroic ceramics /
- remnant magnetization /
- remnant polarization
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[1] Hill N A 2000 J. Phy. Chem. B 104 6694
[2] Eerenstein W,Mathur N D,Scott J F 2006 Nature. 442 75
[3] Wang J,Neaton J B,Zheng H,Nagarajan V,Ogale,S B,Liu,B,Viehland D,Vaithyanathan V,Schlom D G,Waghmare U V,Spaldin N A,Rabe K M,Wuttig M,Ramesh R 2003 Science 299 1719
[4] Sun Y,Huang Z F,Fan H G,Ming X,Wang C Z,Chen G 2009 Acta Phys. Sin. 58 193 (in Chinese) [孙 源、黄祖飞、范厚刚、明 星、王春忠、陈 岗 2009 58 193]
[5] Smolenskii G A,Chupis I 1982 Sov. Phys. Usp. 25 475
[6] Teague J R,Gerson R,James W J 1970 Solid State Commun. 8 1073
[7] Dong X W,Wang K F,Wan J G,Zhu J S,Liu J M 2008 J. Appl. Phys. 103 094101
[8] Park B H,Kang B S,Bu S D,Noh T W,Lee J,Jo W 1999 Nature (London) 401 682
[9] Wang W,Sun J B,Mao X Y,Chen X B 2008 J. Phys. D:Appl. Phys. 41 155418
[10] Luo B C,Zhou C C,Chen C L,Jin K X 2009 Acta Phys. Sin. 58 4563 (in Chinese) [罗炳成、周超超、陈长乐、金克新 2009 58 4563]
[11] Snedden A,Hervoches C H,Lightfoot P 2003 Phys. Rev. B 67 092102
[12] Newnham R E,Wolfe R W,Dorrian J F 1971 Mat. Res. Bull. 6 1029
[13] Ahn S L,Noguchi Y J,Miyayama M,Kudo T 2000 Mat. Res. Bull. 35 825
[14] Du Y L,Zhang M S,Chen Q,Yuan Z R,Yin Z,Zhang Q A 2002 Solid State Commun. 124 113
[15] Zhang S T,Chen Y F,Liu Z G,Ming N B 2005 J. Appl. Phys. 97 104106
[16] Li X,Peng Z Y,Fan W,Guo K,Gu J M,Zhao M Y,Meng J F 1996 Mat. Chem. Phys. 46 50
[17] Zhu J,Mao X Y,Chen X B 2004 Acta Phys. Sin. 53 3929 (in Chinese) [朱 俊、毛翔宇、陈小兵 2004 53 3929]
[18] Zhu J,Chen X B,He J H,Shen J C 2007 Phys. Lett. A 362 471
[19] Rondinelli J M,Spaldin N A,2009 Phys. Rev. B 79 054409
[20] 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
[21] Hyatt N C,Joseph A,Hriljac,Comyn T P 2003 Mater. Res. Bull. 38 837
[22] Shimakawa Y,Kubo Y,Nakagawa Y,Goto S,Kamiyama T,Asano H,Izumi F 2000 Phys. Rev. B 61 6559
[23] Shannon R D 1976 Acta Crystallogr. Scet. A 32 751
[24] Kroger F A,Vinik H 1956 J. Solid State Phys. 3 307
[25] Kroger F A,Vinik H 1998 Phys. Lett. B 12 371
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