| 镧掺杂对大洋锰结核制备铁氧体磁性的影响 |
| Effect of La Doping on Magnetic Properties of Ferrite Prepared from Ocean Manganese Nodules |
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| 摘要: |
| 关键词: 镧掺杂 大洋锰结核 锰铁氧体 磁性 |
| 基金项目: |
| Abstract: La doped ferrite was prepared by solid state reaction with marine manganese nodules from East Pacific seafloor as raw material, NaOH as flux, La(NO3)3 as doping agent. XRD analysis shows that the ferrite is in spinel structure and its molecular formula can be expressed as MnFe2-xRxO4. SEM images prove that the ferrites possess perfect cubic aspects, and the structure of ferrite changes from octahedral to cubic one with the increase in La doping. Magnetic properties of ferrites with different La doping amounts were measured. A small quantity of La doping could increase the crystal dimension, improve magnetic susceptibility of Mn-ferrites. When La molar fraction exceeds 0.03, magnetic susceptibility of the ferrites decreases because of increase in the quantity of impurities. When the doping amount is 0.03(molar ratio), the susceptibility of the ferrite reaches its maximum. The La doped ferrite is a kind of soft magnetic matter that is easily to be magnetized with rather weak coercive force. |
| Keywords: lanthanum doping marine manganese nodule Mn-ferrite magnetic properties |
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| 张平萍,韩沉花,程继鹏,陈雪刚,叶 瑛.镧掺杂对大洋锰结核制备铁氧体磁性的影响[J].无机化学学报,2008,24(2):307-310. |
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