Citation: DAI Jian-Feng, GAO Hui-Fang, WANG Jun-Hong, FU Bi. Preparation and Magnetic Properties of La-Co Co-Doped M-Type Strontium Ferrite Nanofibres[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 729-732. doi: 10.3866/PKU.WHXB201112211 shu

Preparation and Magnetic Properties of La-Co Co-Doped M-Type Strontium Ferrite Nanofibres

1.
1. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, P. R. China;
2. School of Science, Lanzhou University of Technology, Lanzhou 730050, P. R. China

Received Date: 1 August 2011
Available Online: 21 December 2011
Fund Project: 国家自然科学基金(50873047)资助项目 (50873047)

Polyethylene pyrrole (PVP) and metal nitrate were used as precursors, La and Co co-doped M-type strontium ferrites Sr_1-xLa_xFe_12-xCo_xO₁₉ (x=0.12) (SLFC) were prepared by electrospinning, sol-gel, and subsequent heat treatment processing. The crystal structure, morphology, and magnetic properties of the samples were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID). The influences of the variation of sintering temperature on the magnetic properties of SLFC were systematically investigated. The experimental results show that the optimum values of the magnetic properties were obtained at 950 °C for 2 h, and the coercivity (H_c), saturation magnetization (M_s), and remanence (M_r) values of the samples were 498.53 kA·m^-1, 70.76 A·m²·kg^-1, and 36.35 A·m²·kg^-1, respectively. Pure-phase bamboo-like SLFC nanofibres with diameter of about 55 nm were fabricated. The magnetic properties of undoped SrFe₁₂O₁₉ (SF) were improved obviously, and the SF nanofibres exhibited better magnetic properties than the corresponding nanoparticles obtained by the sol-gel processing.
- Nanofibre,
- La-Co co-doped strontium ferrite,
- Magnetic property,
- Electrospinning,
- Sol-gel method
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