Fabrication and Magnetic Property of BaSmxFe12–x O19 (x ≦ 0.4) Nanofibers
Abstract:BaSn x Fe12–x O19 (x ≦ 0.4) ferrite nanofibers were prepared by sol–gel method from starting reagents of metal salts and citric acid. These nanofibers were characterized by TG-DTA, FTIR, SEM, XRD and VSM. These results show that the BaSn x Fe12–x O19 (x ≦ 0.4) ferrite nanofibers were obtained subsequently from calcination at 750 °C for 1 h. The BaSn x Fe12–x O19 (x ≦ 0.4) microstructure and magnetic property are mainly influenced by chemical composition and heat-treatment temperature. The grain sizes of BaSm0.3Fe11.7O19 ferrite nanofibers are in a nanoscale from 40 nm to 62 nm corresponding to the calcination temperature from 750 °C to 1050 °C. The saturation magnetization of BaSn x Fe12–x O19 ferrite nanofiber calcined at 950 °C for 1 h initially decreases with the Sm content from 0 to 0.3 and then increases with a further Sm content, while the coercivity exhibits a continuous increase from 348 kA·m−1 (x = 0) to 427 kA·m−1 (x = 0.4). The differences of magnetic properties are attributed to lattice distortion and enhancement for the anisotropy energy.
Document Type: Research Article
Publication date: March 1, 2012
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