| Sm3+含量对BaSmxFe12-xO19 (x≤0.4)铁氧体纳米纤维结构和磁性能的影响 |
| Effect of Sm3+ Substitution on Structure and Magnetic Properties of BaSmxFe12-xO19(x≤0.4) Ferrite Nanofiber |
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| 摘要: 以金属盐和柠檬酸为原料，采用溶胶-凝胶法制备直径在1 μm以内的BaSmxFe12-xO19(x≤0.4)铁氧体纳米纤维。采用FTIR、SEM、EDS、XRD和VSM对BaSmxFe12-xO19(x≤0.4)铁氧体纳米纤维进行表征。结果表明，经950 ℃烧结后，BaSmxFe12-xO19(x≤0.4)铁氧体已成相，且其微观结构和磁性能受掺杂离子浓度的影响。随着Sm3+含量的增加，饱和磁化强度呈先减小后增大的趋势，而矫顽力随Sm3+含量增加而逐渐增大，由x=0时的348.8 kA·m-1增大到x=0.4时的427.5 kA·m-1。与之相对应，在液氮(77 K)条件下，纤维的饱和磁化强度有显著的提高，而矫顽力则明显下降，这主要是由于纳米晶的表面自旋提高造成的。 |
| 关键词: 钡铁氧体 Sm3+掺杂 纤维 磁性能 自旋 |
| 基金项目: |
| Abstract: BaSmxFe12-xO19(x≤0.4) ferrite nanofibers below 1 μm were prepared by sol-gel method from starting reagents of metal salts and citric acid. These nanofibers were characterized by FTIR, SEM, EDS, XRD and VSM. The results show that the BaSmxFe12-xO19(x≤0.4) ferrites were obtained at 950 ℃. The microstructure and magnetic property of nanofibers are mainly influenced by Sm3+ contents. The specific saturation magnetization of BaSmxFe12-xO19 ferrite nanofiber calcined at 950 ℃ initially decreases and then increases with a further Sm content, while the coercivity exhibits a continuous increase from 348.8 kA·m-1(x=0) to 427.5 kA·m-1(x=0.4). The differences of magnetic properties are attributed to surface spin. |
| Keywords: barium ferrite Sm substitution fibers magnetic property surface spin |
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| 孟献丰,郭立举,沈湘黔.Sm3+含量对BaSmxFe12-xO19 (x≤0.4)铁氧体纳米纤维结构和磁性能的影响[J].无机化学学报,2012,28(2):263-268. |
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