【摘要】 利用柠檬酸溶胶-凝胶法制备M型锶铁氧体SrFe12-xAlxO19(0<x<2.5)纳米粉体,同时利用X射线衍射(XRD)以及振动样品磁强计(VSM)对制备的各种样品的结构以及磁性能进行研究。大量的实验结果表明,Al3+离子可以进入到锶铁氧体次晶格来替代Fe3+,纳米锶铁氧体仍保持磁铅石相结构。VSM研究结果显示M型锶铁氧体SrFe12-xAlgO19(0<x<2.5)样品的饱和磁化强度Ms和剩余磁化强度Mr随掺杂量x的增加基本呈线性降低关系,Ma从x=0的63.5(A·m2)/kg下降至x=2.5的23.8(A·m2)/kg。样品的矫顽力Hc随Al掺杂量x的增加总体呈增加趋势,当x=1.5时Hc达到最大约7.8×104A/m。更多还原

【Abstract】 M-type SrFe12-xAlxO19 (0<x<2.5) nanoparticles were synthesized by the citrate sol-gel technique, and then the X-ray diffraction (XRD) and the vibrating sample magnetometer (VSM) were introduced to analyze the microstructure and the magnetic properties of the as-prepared SrFe12-xAlxO19. The experimental results have shown Al3+ ions could substitute Fe3+ ions in the sublattice of SrFe12-xAlxO19 ferrite, and the samples of M-type SrFe12-xAlxO19 (0<x<2.5) nanoparticles remain the hexagonal magnetoplumbite phase. The saturation magnetization Ms and remanence Mr of M-type SrFe12-xAlxO19 (0<x<2.5) nanoparticles linearly decrease with the increasing of x. When x = 0, Ms is 63.5 (A·m2)/kg and Ms=23.8 (Am2)/kg with x=2.5. The coercivity Hc of the samples increase with the doped Al, and reach maximum Hc=7.8×104A/m for x=1.5.更多还原