LU Yi ¹ , LIU Mingquan ² , SHEN Xiangqian ² , SONG Fuzhan ²

(1. Comprehesive Technology Center, Zhenjiang Entry-Exit Inspection and Quarantine Bureau of P. R. C, Zhenjiang Jiangsu 212008, China; 2. School of Material Science and Engineering, Jiangsu University, Zhenjiang Jiangsu 212013, China)

Abstract: Sr_1-xLa_xZn_xFe_12-xO₁₉/poly (vinyl pyrrolidone) (PVP) (0.0≤x≤0.4) precursor nanofibers were prepared by electrospinning from starting reagents of metal salts and PVP. The Sr_1-xLa_xZn_xFe_12-xO₁₉ nanofibers were obtained subsequently by calcination of these precursors at 800~1100℃. The composite fibers and Sr_1-xLa_xZn_xFe_12-xO₁₉ nanofibers were characterized by XRD, SEM, EDS and VSM. The results show that, the Sr_1-xLa_xZn_xFe_12-xO₁₉ nanofiber's microstructure and magnetic property are mainly influenced by the calcination temperature and the substituted ions contents. The nanofiber grain size is in a nanoscale from 49.9 to 41.1 nm corresponding to the substitution content from 0 to 0.4. The specific saturation magnetization of Sr_1-xLa_xZn_xFe_12-xO₁₉ nanofibers initially increases with the La-Zn content, reaching a maximum value 72 Am²·kg^-1 at x=0.2, and then decreases with a further La-Zn content increase up to x=0.4, while the coercivity exhibits a continuous reduction from 413 (x=0) to 288 kAm^-1 (x=0.4).

Key words: M-type ferrite; La-Zn substitution; nanofibers; electrospinning; magnetic property