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.%以金属盐和柠檬酸为原料,采用溶胶-凝胶法制备直径在1μm以内的BaSmxFe12-xO19(x≤0.4)铁氧体纳米纤维.采用FTIR、SEM、EDS、XRD和VSM对BaSmx Fe12-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(≤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.
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