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用固相法制备了镧掺杂M型钡铁氧体(Ba1-xLaxFe12O19, x=0.0—0.6), 针对不同取代量与不同温度的烧结, 研究取代量和温度对钡铁氧体微结构和磁性能的影响. 在烧结温度为1100—1175 ℃, 当x=0.0—0.6时, 样品主要有单一的六角M型钡铁氧体相构成. SEM表明, La离子的加入不会影响钡铁氧体微观形貌.在磁性能方面, 随着La离子的增加, 钡铁氧体的饱和磁化强度先增加后减小, 矫顽力逐渐增加. 在同一取代量下, 钡铁氧体的饱和磁化强度随烧结温度升高呈现上升趋势, 矫顽力随着烧结温度的升高而降低. 饱和磁化强度在x=0.2, 烧结温度1175 ℃时达到最大值62.8 emu/g, 矫顽力在x=0.6, 烧结温度1125 ℃时达到最大值3911.5 Oe.Magnetic properties of La doped M-type barium ferrites are studied. The samples are prepared by the standard solid state reaction method. The influences of La3+ on structures and magnetic properties of barium ferrites (Ba1-xLaxFe12O19) are investigated. Single-phase M-type barium ferrites with chemical composition of Ba1-xLaxFe12O19 (x=0.0—0.6) are formed by sintering at 1100—1175 ℃ in air. Scanning electron microscopy (SEM) reveals that the La doping has no effect on the structure of barium ferrite. Vibrating sample magnetometer (VSM) shows that with the valaue of x increasing, the saturation magnetization (Ms) increases, reaching a maximum at x=0.2 and then decreases and the coercivity of the sample increases continuously. The value of Ms reaches a maximum value of 62.8 emu/g at x=0.2 and 1175 ℃, and the Hc reaches a maximum value of 3911.5 Oe at x=0.6 and 1125℃.
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Keywords:
- magnetic properties /
- barium ferrite /
- La-substituted
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[1] Bao H W, Fang Q Q.2004 J. Magn. Mater. Devices. 35 22 (in Chinese) [鲍恒伟, 方庆清 2004 磁性材料及器件 35 22]
[2] Fang Q Q, Jiao Y F, Li R, Wang J Z, Cheng H 2005 Acta Phys. Sin. 54 1826 (in Chinese) [方庆清, 焦永芳, 李锐, 汪金芝, 陈辉 2005 物理学报 54 1826]
[3] Guo R Q, Li H G, Sun P M, Li Y J, Zhao Z W. 2001 Chin. J. Rare. Metals. 25 87 (in Chinese) [郭睿倩, 李洪桂, 孙培梅, 李运姣, 赵中伟 2001 稀有金属 25 87]
[4] Yang Y J, Gu W G. 2009 J. Huaiyin Teachers college (Natural Science Edition) 8 27 (in Chinese) [杨玉军, 辜卫国 2009 淮阴师范学院学报 (自然科学版) 8 27]
[5] Zhong W, Ding W P, Zhang N 1997 J. Magn. Magn. Mater. 168 196
[6] Qiao L, Jiang M Y, Zheng J W, You L S, Jiang L Q 2007 J. Mater. Engineering 8 20(in Chinese) [乔梁, 将梅燕, 郑精武, 游李顺, 姜力强 2007 材料工程 8 20]
[7] Guo H, Liu Y C, Liu D C, Wang J H 2009 Shanxi Chem. Ind. 29 1(in Chinese) [郭豪, 刘玉存, 刘登程, 王建华 2009 山西化工 29 1]
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[9] Lan Y H, Gao X X, Qiao Y, Gao J, Bao X Q 2007 Mater. Review. 21 333 (in Chinese) [兰银辉, 高学绪, 乔祎, 高静, 包小倩 2007 材料导报 21 333]
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