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Nano-structure CoxFe3-xO4 porous microspheres are synthesized in ethylene glycol (EG) solution, using FeCl3·6H2O, CoCl2·6H2O and NH4Ac as the starting materials through solvothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) are used to characterize the structures of synthesized products. The results show that monodisperse CoxFe3-xO4porous microspheres with polycrystal structures are assembled by nanoparticles, and the average diameters is about 300 nm. The magnetic properties are evaluated with a vibrating sample magnetometer (VSM). The results indicate that the saturation magnetization ( Ms) and the Curie temperature (Tc) first increase and then decrease, and the coercivity (Hc) increase with the increase of Co2+ content. According to the hysteresis loops at different temperatures, CoxFe3-xO4 porous microspheres possess remarkable exchange bias effects at low temperatures.
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Keywords:
- CoxFe3-xO4 /
- porous microspheres /
- magnetic properties /
- exchange bias
[1] Cao S W, Zhu Y J, Ma M Y, Li L, Zhang L 2008 J. Phys. Chem. C 112 1851
[2] Hyeon T, Lee S S, Park J, Chung Y, Na H B 2001 J. Am. Chem. Soc. 123 12798
[3] Wang Y, Teng X, Wang J 2003 Nano. Lett. 3 789
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[7] Huang Z B, Tang F Q 2005 J. Colloid Interface Sci. 281 432
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[17] Vander Z P J, Ijiri Y, Borchers J A, Feiner L F, Wolf R M, Gaines J M, Erwin R W, Verheijen M A 2000 Phys. Rev. Lett. 84 6102
[18] Kodama R H, Berkowitz A E, Mcniff E J, Foner S 1996 Phys. Rev. Lett. 77 394
[19] Kodama R H, Berkowitz A E 1999 Phys. Rev. B 59 6321
[20] Martinez B, Obradors X, Balcells L, Rouanet A, Monty C 1998 Phys. Rev. Lett. 80 181
[21] Ong Q K, Wei A, Lin X M 2009 Phys. Rev. B 80 134418
[22] Nogues J, Schuller I K 1999 J. Magn. Magn. Mater. 192 203
[23] Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2758 (in Chinese) [田宏玉、许小勇、胡经国 2009 58 2758]
[24] Fitzsimmons M R, Kirby B J, Roy S, Li Z P, Roshchim I V, Sinha S K, Schuller I K 2007 Phys. Rev. B 75 214412
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[1] Cao S W, Zhu Y J, Ma M Y, Li L, Zhang L 2008 J. Phys. Chem. C 112 1851
[2] Hyeon T, Lee S S, Park J, Chung Y, Na H B 2001 J. Am. Chem. Soc. 123 12798
[3] Wang Y, Teng X, Wang J 2003 Nano. Lett. 3 789
[4] Kim D K, Zhang Y, Kehr J, Klason T, Bjelke B, Muhammed M 2001 J. Magn. Magn. Mater. 225 256
[5] Gan Z P, Guan J G 2006 Acta Phys. Chim. Sin. 22 189 (in Chinese)[甘治平、官建国 2006 物理化学学报 22 189]
[6] Shiho H, Kawahashi N 2000 J. Colloid Interface Sci. 226 91
[7] Huang Z B, Tang F Q 2005 J. Colloid Interface Sci. 281 432
[8] Yu L J, Yuan F L, Wang X 2008 Chin. J. Chem. Eng. 8 394 (in Chinese) [俞凌杰、袁方利、王 熙 2008 过程工程学报 8 394]
[9] Fan X 1996 Metallic X-ray Physics(Beijing: Mechanical Industry) p103—122 (in Chinese) [范 雄 1996 金属X射线学(北京:机械工业) 第103—122页]
[10] Zhang Y G 1988 Magnetic Materials( Chengdu: Institute of Electrommunication and Engineering) p28—47 (in Chinese) [张有纲 1988 磁性材料(成都:电讯工程学院) 第28—47页]
[11] De Guire M R, Handley R C O, Kalonji G 1989 J. Appl. Phys. 65 3167
[12] Wang L, Wang H B, Wang T, Li F S 2006 Acta Phys. Sin. 55 6515 (in Chinese) [王 丽、王海波、王 涛、李发伸 2006 55 6515]
[13] Chen X Y, Wang Z H, Wang X, Zhang R, Liu X Y, Lin W J, Qian Y T 2004 J. Cryst. Growth 263 570
[14] Hou H H, Peng Q, Zhang S Y, Guo Q X, Xie Y 2005 Eur. J. Inorg. Chem. 2005 2625
[15] Peng Q, Dong Y J, Li Y D 2003 Angew. Chem. Int. Ed. 42 3027
[16] Dou Y W 1996 Ferrite (Nanjing: Jiangsu Science and Technology ) p67 (in Chinese)[都有为 1996 铁氧体(南京:江苏科学技术)第67页]
[17] Vander Z P J, Ijiri Y, Borchers J A, Feiner L F, Wolf R M, Gaines J M, Erwin R W, Verheijen M A 2000 Phys. Rev. Lett. 84 6102
[18] Kodama R H, Berkowitz A E, Mcniff E J, Foner S 1996 Phys. Rev. Lett. 77 394
[19] Kodama R H, Berkowitz A E 1999 Phys. Rev. B 59 6321
[20] Martinez B, Obradors X, Balcells L, Rouanet A, Monty C 1998 Phys. Rev. Lett. 80 181
[21] Ong Q K, Wei A, Lin X M 2009 Phys. Rev. B 80 134418
[22] Nogues J, Schuller I K 1999 J. Magn. Magn. Mater. 192 203
[23] Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2758 (in Chinese) [田宏玉、许小勇、胡经国 2009 58 2758]
[24] Fitzsimmons M R, Kirby B J, Roy S, Li Z P, Roshchim I V, Sinha S K, Schuller I K 2007 Phys. Rev. B 75 214412
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