Fabrication and Magnetic Property of M-type Strontium Ferrite Nanofibers by Electrospinning

doi:10.3724/SP.J.1077.2010.00068

Abstract

Abstract:

SrFe₁₂O₁₉/PVP composite fiber precursors were prepared by electrospinning with ferric nitrate, strontium nitrate and polyvinylpyrrolidone (PVP) as starting reagents. M-type strontium ferrite nanofibers are obtained subsequently from calcination of these precursors at 800-1100℃. The composite fibers and M-type strontium ferrite nanofibers are characterized by FTIR, TG/DSC, XRD, SEM and VSM. The diameters for the composite fibers are influenced by the metal salt concentration in solution during the electrospinning process and increase from about 300nm to 550nm corresponding the metal salt concentration in the range from 12.5wt% to 23.1wt%.The Mtype strontium ferrite nanofibers calcined at 800℃ for 2h are characterized with a diameter range of 100nm to 150nm, crystalline size around 49nm which will increases with the increase of calcination temperature. The saturation magnetization of M-type strontium ferrite nanofibers tends to increase with the crystalline size increasing. The coercivity increases as the crystalline size less than the critical size of a single-domain of 61nm while decreases as the crystalline size larger than 61nm. The M-type strontium ferrite nanofibers calcined at 1000℃ for 2h, with an average diameter of about 100nm and crystalline size of around 61nm, exhibit the best magnetic properties at room temperatures, with saturation magnetization of 68.5A·m2/kg and coercivity of 503kA/m, respectively.

Key words: M-type strontium ferrite, nanofibers, electrospinning, magnetic property

CLC Number:

TQ174

LIU Ming-Quan,SHEN Xiang-Qian,MENG Xian-Feng,SONG Fu-Zhan,XIANG Jun. Fabrication and Magnetic Property of M-type Strontium Ferrite Nanofibers by Electrospinning[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00068.

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