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The BiFeO3 nano-powder has been synthesized by sol-gel method. The structure and morphology of BiFeO3 nano-powder have been characterized by X-ray diffraction （XRD），scanning electron microscopy （SEM） and high resolution transmission electron microscopy （HRTEM）. The results showed that the samples sintered at 700℃ for 2 h or 25 h is in the formed of pure BiFeO3 with the grain size about 30 nm，and the structure is hexagonal of R3-m［166］ space group with lattice constants a=b=05580 nm，c=06939 nm，and the spacing of （101） and （110） are about 0396 nm and 0273 nm，respectively. The room temperature magnetic properties of samples have been measured on vibrating sample magnetometer （VSM）. It was showed that the BiFeO3 nano-powder gives a complete hysteresis loop，which means that BiFeO3 nano-powder possesses weakly ferromagnetic at room temperature，its coercive force （Hc） could reach to over 700 Oe，and the magnetic mechanism comes from the double exchange of Fe3+-O-Fe2+. Moreover，with the increase of the sintering time，the grain size is influenced；the saturation magnetization （Ms） has a small change，however，the coercive force （Hc） of the BiFeO3 nano-powder decreased obviously.
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Keywords:
- sol-gel method /
- BiFeO3 nano-powders /
- structure characterization /
- ferromagnetic properties
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[1] ［1］Hill N A 2000 J. Phys. Chem.B 104 6694
[2] ［2］Zhou J P，Shi Z，Liu G，He H C，Nan C W 2006 Acta Phys. Sin. 55 3766 （in Chinese）［周剑平、施展、刘刚、何泓材、南策文 2006 55 3766］
[3] ［3］Fillippetti A，Hill N A 2001 J. Magn. Magn. Mater. 236 176
[4] ［4］Murashav V A，Rakov D N，Ionov V M，Dubenko I S，Titov 1994 Ferroelectrics 162 11
[5] ［5］Fischer P，Polomska M，Sosnowska I，Szymanski M 1980 J. Phys. 13 1931
[6] ［6］Ruette B，Zvyagin S，Pyatakov A P，Bush A，Li J F，Belotelov V I，Zvezdin A K，Viehland D 2004 Phys. Rev. B 69 064114
[7] ［7］Tang C H，Cai M Q，Yin Z，Zhang M S 2004 Acta Phys. Sin. 53 2931 （in Chinese）［唐春红、蔡孟秋、尹真、张明生 2004 53 2931］
[8] ［8］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］
[9] ［9］Qi X D，Dho J，Blamire M，Jia Q X，Lee J S，Foltyn S，MacManus-Driscoll J L 2004 J. Magn. Magn. Mater. 283 419
[10] ］Kumar M M，Palkara V R，Srinivas K，Suryanarayana S V 2000 Appl. Phys. Lett. 76 2764
[11] ］Wang Y P，Zhou L，Zhang M F，Chen X Y，Liu J M，Liu Z G 2004 Appl. Phys. Lett. 84 1731
[12] ］Liu H R，Liu Z L，Liu Q，Yao K L 2006 Thin Solid Films. 500 105
[13] ］Epifani M 2007 Mater. Lett. 61 3100
[14] ］Matsui T，Taketani E，Fujimura N，Ito T，Morii K 2003 J. Appl. Phys. 93 6993
[15] ］Taketani E，Matsui T，Fujimura N，Morii K 2004 IEEE Trans. Magn. 40 2736
[16] ］Matsui T，Taketani E，Fujimura N，Tsuda H，Morii K 2005 Appl. Phys. Lett. 86 082902
[17] ］Ren P，Guan J G，Cheng X D 2006 Mater. Chem. Phys. 98 93
[18] ］Zhong C G，Jiang Q，Fang J H，Ge C W 2009 Acta Phys. Sin. 58 3491 （in Chinese）［仲崇贵、蒋青、方靖淮 2009 58 3491］
[19] ］Lu Y，Li Q A，Di N L，Cheng S H 2003 Acta. Phys. Sin. 52 1250 （in Chinese）［鲁毅、李庆安 邸乃力、成昭华 2003 52 1250］
[20] ］Han L A，Chen Ch L，Dong Y H，Wang J Y，Gao G M，Luo B C 2008 Acta. Phys. Sin. 57 541 （in Chinese）［韩立安、陈长乐、董慧迎、王建元、高国棉、罗炳成 2008 57 541］
[21] ］Liu Y Y，Liu F M，Shi X，Ding P，Zhou C C 2008 Acta Phys. Sin. 57 7275 （in Chinese）［刘妍妍、刘发民、石霞、丁芃、周传仓 2008 57 7275］
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